Deck of Many Hallways wondrous, very rare

This deck of sturdy playing cards have a beautiful abstract design and when inspecting them you can see an endless void through their suits. While counting or shuffling this deck it is easy to lose track of where you are. As an action you may draw a card and activate it by placing it against a vertical surface at least 5-foot square within reach. When activated a card opens up an interdimensional hallway. You can choose how for this hallway goes; For instance “until the other side of this wall”, or “250 feet”, however the maximum distance traveled is the value of the drawn card times 50 feet. Numbered cards’ values are equal to their number, while face and ace card values are 10 and 15 respectively. After a card is activated its suits fade. A faded card has a value of 2 when activated again, regardless of its actual number or type. Once all cards in the deck have been activated this item becomes a mundane deck of playing cards.

Interdimensional Hallways

Interdimensional hallways created by this deck are always one tenth the length on the inside as they are on the outside, so a 100 foot hallway would only take 10 feet to travel through. These hallways are not visible or tangible in any way from outside them except for the one-way doors at each end and last for one hour or until one of the doors is destroyed. If a door is destroyed before it collapses creatures in the hallway must make a DC 12 Dexterity Saving throw. On a failure they take 2d10 bludgeoning damage and are expelled out of the hallway from the closest door; However, on a critical failure the creature is transported to another plane or demiplane of the DM’s choice instead. On a success they take half as much damage and can choose which door they are expelled from.

Viper's Vertebrae wondrous, rare (requires attunement)

This unique bracelet is made from snake vertebrae and features silver and topaz charms. When within 15 feet of a snake the vertebrae vibrate subtly, creating a quiet rattle.
As an action you can choose to transform into a snake. You can choose to appear as any species of snake and for your size to either be Tiny or Huge. Your hit points, physical, and mental ability scores are not replaced; However you are limited in the actions you can perform. You cant speak, cast spells, or take any other action that requires hands or speech. Additionally, your gear melds into the snake form and you can not activate, use, wield, or otherwise benefit from your equipment. As an action, or if you become incapacitated, you revert to your original form.
If you are a Tiny snake you gain a swimming speed equal to your walking speed and a climbing speed of 20 feet. If you are a Huge snake you gain advantage on Intimidation checks and Strength checks. As either size you gain Blindsight out to 10 feet.

Ring of Fallen Leaves ring, artifact (requires attunement by a creature that knows planar magic)

This ring is a complicated tangle of copper and bronze oak leaves. It magically resizes to fit any finger you put it on.
This item holds 10 charges and regains 1 expended charge each day at dawn.
While attuned to this ring you can identify the type of any tree you can see, and have proficiency in Intelligence(Nature) checks.

Plane of Perpetual Autumn

While attuned with this ring you are aware of, and in control of, the Demiplane of Perpetual Autumn. This demiplane is a lush deciduous forest with a giant oak many times larger than normal at the center. The trees in this forest are always beautiful warm tones with the occasional purple. You can walk for several miles in any direction before finding the edge of the demiplane. If you concentrate, you know of all creatures within the demiplane and where they are.

Ever-present Portal

As an action you can expend 2 charges to create a portal to the Demiplane of Perpetual Autumn, or a portal from the demiplane to the Prime Material plane, that lasts for 1 hour or until you create another portal. This costs 1 less charge if you create the portal adjacent to a Huge or larger oak tree.
The portal you create is 5 feet wide, 10 feet tall, and is bordered by branches. You can expend an additional 2 charges to double the size of the portal. When you create a portal to the Material Plane you can choose any location you are very familiar with, or a permanent teleport circle. When you create a portal to the demiplane you can choose any location within it.

If you create a portal in the same location for 8 consecutive days that portal becomes a permanent portal. A permanent portal can only be dispelled by Dispel Magic cast at 9th level, Wish, or if this ring has at least 1 charge and you expend all remaining charges to destroy it.

Helmet of Occlusion wondrous, rare (requires attunement)

This helmet is very notably missing any way to see out of it as its visor is completely solid, but it is overlaid with a multitude of artistically crafted eyes.
While wearing this helmet you have blindsight out to 60 feet and are blind beyond that radius. Blindsight allows you to see through obscured areas, magical and nonmagical darkness, and you can not be Blinded by most effects, but it does not allow you to see through walls or objects. This particular blindsight allows you to see creatures and objects easily, but things such as words on a page, or colors, are impossible. Creature’s basic emotions and health are expressed via color.
Additionally, creatures trying to determine your thoughts or mood via mundane means, such as an Insight check, have disadvantage while you are wearing this helmet.

Curse. If you doff this helmet after wearing it for an hour or longer, you are Blinded for 1 minute for each hour you were wearing it, up to 1 hour total. This effect can not be removed by Lesser Restoration.

Augmier's Cozy Cottage wondrous, very rare

This large 1-foot diameter orb holds a diorama of a wattle and daub cottage in the woods. This diorama changes with the seasons and is intricately detailed. 
In the diorama you can see a gnomish word chiseled into the side of the cottage. If you speak this command word while holding the orb and standing on a reasonably flat area with at least a 20-foot cube of space you suddenly find yourself inside the cottage. The cottage instantly transports from the orb into the space you are standing, and any creatures in the space the cottage now occupies are placed in a free space within the cottage if they fit, or outside if they do not.
This 20-foot square cottage is furnished with 3 bunk beds, a large table with 6 chairs, a fireplace, and several empty bookshelves and chests along the wall.
If you speak the command word again while touching both the cottage and orb, the cottage and any objects in the shelves or chests return to the orb. Any creatures in the cottage remain where they were.
The cottage can only be taken from and returned to the orb once per day.

Pamsprei's Stabilizing Powder wondrous, common

This pouch of coarse yellow powder smells almost sickly sweet but has no noticeable taste. When dissolved into a liquid it keeps it from souring or going bad for an additional 3 days the first time it is added, but its effects are removed by Purify Food And Drink.
This pouch contains enough for up to 10 gallons of liquid.

Companion's Compass wondrous, rare

This set of five identical compasses are lacking the distinctive cardinal direction markers you might be expecting, and you also note they each have four pointers, rather than one.
So long as these compasses are on the same plane of existence as each other they will always point to each other. If a compass is on another plane any corresponding pointer will begin spinning in circles until the compass it points to is again on the same plane.

Charm of Isoptera wondrous, uncommon

This small fired clay orb has an intricate network of bored holes through it. 
This item has 10 charges and regains 1 expended charge each day at dawn.

As an action you can touch this orb to a surface made of wood or clay and expend a number of charges. A number of cubic feet of material is destroyed equal to the number of charges expended as the area is swarmed with phantom termites. The material removed can be in any shape, so long as it is contiguous and not overly complex.

Gemcutter weapon(warpick), rare

This otherwise ordinary pick has three empty facets in its head where gemstones might be set. Each facet is surrounded by a delicate circlet of runes.
When you make a successful attack with this weapon it gains one charge.

As an action you can press on a semi-precious stone or gem set within one of this item’s facets and expend a number of charges to magically refine it. Expending 5 charges increases its value by 10 gold. Expending 10 charges increases its value by 25 gold. Gems and semi-precious stones refined in this way can not be increased to be worth more than 100 gold.

The Bathyal's Mask wondrous, very rare (requires attunement)

This tarnished silver mask covers the bottom of your face and is heavily inlaid with turquoise and coral. This item has 12 charges and regains 2d6 expended charges each day at dawn.

Breath of the Deep

As an action while wearing this mask you can expend a charge to activate it, sealing it tightly to your face. For the next hour you can breathe normally in any environment, and you have advantage on Saving Throws made against harmful gases and vapors.

Tidal Pressure

As an action you can expend a number of charges to create a 30-foot sphere of brackish water, within 120 feet of you, for each charge spent. These spheres last for 10 minutes before evaporating. Any creature inside these spheres must make a DC 16 Strength check to move outside of the sphere.
Additionally, as an action you can expend a number of charges to target that many creatures inside the brackish spheres. Each targeted creature must make a DC 16 Strength saving throw as the water churns around them. On a failure, the target creature takes 4d10 bludgeoning damage and is Restrained. On a success they take half as much damage and are not Restrained. A Restrained creature can repeat the saving throw at the end of each of its turns, ending the effect on a success.

Planar Godfather Clock wondrous, uncommon

This looming grandfather clock has 5 faces arranged whimsically along its chestnut trunk. The primary face of this clock is a typical mundane mechanism, but the 4 smaller faces are magically aligned with different locations or planes.
You can cast a spell that allows vision or transport to another location, such as Scrying or Plane Shift, using one of these clocks as a spellcasting focus. When you do so that clock face will transform to be able to show the current time at the target location of the spell, including visually representing when dusk and dawn occur.
If the target location does not have a concept of day and night, or the day/night cycle is longer than 48 hours, the clock face becomes blank, and will remain blank until aligned with a new location.

Fan of Elemental Flame wondrous, rare

This fan has a beautifully engraved case of brass and each time you open it has a different vibrant design on its face.
As a bonus action you can open this fan, which stays open for the next minute or until you close it again. When you open the fan its design, which corresponds to an element, is chosen randomly by rolling a d6. The elements are as follows: Acid, Cold, Lightning, Necrotic, Poison, and Radiant.
After opening this fan if you use it as a spellcasting focus to cast a spell of 1st level or higher that deals Fire damage, you can replace half of the spell’s damage dice (rounded down) with the damage type chosen by the fan.

Transcendent Tankard potion, uncommon

This miniature keg is sealed with blue wax and filled with a pint of bitter ale. After drinking all the contents you gain several effects for the next hour.

  • You can see into the Ethereal Plane out to a range of 120 feet as a blue haze.
  • You can see Invisible creatures and objects outlined in a halo of yellow light.
  • You have Tremorsense out to a range of 120 feet.
  • You are Poisoned even if you would normally be immune to the condition.

Each minute you are Poisoned in this way you must make a DC 10 Constitution saving throw or become Stunned for the next minute as you are overwhelmed by everything you see. If the Poisoned condition is removed, or after one hour, you lose all the above effects and gain a level of exhaustion.

Phantom Raven Mantle wondrous, very rare (requires attunement)

This black hooded cape has a mantle of iridescent raven feathers on its shoulders and is trimmed with a similarly iridescent ribbon. This item has 4 charges and regains 1 expended charge each day at sunset, or 1 charge for each raven sacrificed.

As an action you can expend a charge to activate the cloak and a billowing plume of phantom ravens erupts from the mantle. The ravens spread into a 60-foot radius sphere centered on you and move with you for the next minute before disappearing. This area is considered lightly obscured and spreads around corners.

While these ravens surround you, you gain the following benefits:
You always know how many small or larger creatures are within the cloud of ravens, but not what creatures, or where they are.
Additionally, you do not provoke attacks of opportunity. 
Finally, as an action you can command these ravens to attack a creature within the radius. The target creature must make a Wisdom saving throw DC 14. On a failure they take 4d4 Psychic damage and are Blinded until the beginning of their next turn. On a success they take half as much damage and are not Blinded.

Dextrous Digits wondrous, common

This small cloth bag holds what otherwise looks like a human skeletal hand, however it has far too many fingers and two thumbs. After taking the hand out of the bag, as an action you can press it against a puzzle, combination lock, or knot. It can almost immediately untie any knot with at least one loose end, solve any puzzle that can be held in one hand, or rifle through the combinations of a typical combination lock. If the task it is trying to complete is too heavy, or magically protected, it struggles for a moment before giving up. Each time it completes a task it gives you two thumbs up before once again going limp.

Barrel of Brew wondrous, uncommon

This small wooden barrel is made of polished oak and is wrapped with brass bands. It looks like it would hold about 5 gallons but when you pour liquids into this barrel it seems to never overflow. It can hold 200 up to gallons, though it will never weigh more than 50 pounds, regardless of how much is in it. If you attempt to store anything except a liquid in the barrel it will only hold 1 cubic foot of material. If you leave it sealed for an entire month, no matter what liquid was poured into the barrel it will be a stout ale of the same volume when poured out.
Placing this barrel inside an extradimensional space created by a portable hole, or similar item instantly destroys both items in a massive explosion of ale and light. Any creature within 10 feet of the barrel when it explodes becomes completely drunk and is Poisoned for a number of hours equal to 10 minus their Constitution modifier, even if they would otherwise be immune to the condition.

Deck of Many Disguises wondrous, rare

This deck of cards features a well dressed creature from a different profession or walk of life on each card.
As an action you can draw a card from the deck, changing all your clothing, but not your belongings, to match the creature on the card. This clothing fits well, no matter your race or build, and this change lasts until midnight, you draw another card, or Dispel Magic is cast on you. After a card is drawn it disintegrates into threads of cloth.

Suits and Sashes

Numbers are everyday professions, anything from a cobbler or a blacksmith to a clergy member or librarian. Faces are nobility or high ranking individuals. If you draw an Ace you can choose what your outfit is, even an exact match of another creature’s outfit you have seen before. Additionally, you gain a bonus while wearing this outfit based on the suit drawn.
Hearts. You have advantage on Charisma(Persuasion) checks and Wisdom(Insight) checks.
Diamonds. You have advantage on Charisma(Performance) checks and Intelligence(Arcana) checks.
Clubs. You have advantage on Charisma(Intimidation) checks and Strength(Athletics) checks.
Spades. You have advantage on Charisma(Deception) checks and Wisdom(Perception) checks.

Reynier's Crystal Hand staff, rare (requires attunement)

This ebony staff is topped with a lifelike hand carved from shimmering translucent crystal.
It has 10 charges and regains 1d10 expended charges each day at dawn. While attuned to this item you are able to cast Mage Hand if you were not able to before and your mage hand looks identical to the staff’s crystalline hand. Additionally, you can use this staff as a spellcasting focus.

Shimmering Shield

As a reaction to you or a creature you can see being targeted by a ranged weapon or ranged spell attack, you can expend a charge to create a 10-foot wide 15-foot tall crystal hand between the targeted creature and the attack. Each time a hand is created, it appears in a brilliant flash of dazzling lights and each creature within 15 feet of it must make a DC 14 Constitution saving throw or be Blinded until the beginning of it’s next turn.
This crystal hand has 12 AC and 30 hit points and is vulnerable to Force damage. It lasts until it is destroyed or until you use this feature again.

Mystic Mask of Misrepresentation wondrous, rare (requires attunement)

While wearing this masquerade half-mask your mind and aura is masked as well.
After each long rest you can choose a race of humanoid from the following: Dwarf, Elf, Gnome, Halfling, or Human; or the Undead creature type. Until you choose a new type you appear as the chosen type to spells and magic effects that detect creature types, such as a paladin’s Divine Sense, or the trigger of a symbol spell.
Additionally, any creature or effect that tries to read your mind can find no evidence that you are any type other than the one you chose.

Hourglass of Permanence wondrous, legendary (requires attunement)

This exquisite hourglass is carved from ebony, inlaid with white opal, and filled with blackened sand. Gazing into makes you feel microscopic as compared to the inconceivably long stretch of time itself. 

Timeless Knowledge

While attuned with this item you gain proficiency with Intelligence (History) checks and you double your proficiency bonus when making an Intelligence (History) check.

Ageless Magic

While attuned with this item any divination spell that has a cumulative chance of failing, such as augury, or divination, it no longer has a random chance to fail.
Additionally, when you can see a creature casting a ritual, or a spell with a casting time longer than 1 action, you know exactly what is being cast and when the ritual or spell will complete.

Everlasting Presence.

If you concentrate on this hourglass, as if concentrating on a spell, for 1 minute, you can target a creature within 30 feet. The target must succeed on a Wisdom saving throw DC 18 or be bound; if it succeeds, it is immune to this effect for the next 30 days. If the target is a creature who has died within the last hour, their soul is automatically bound within the hourglass. While bound, the creature doesn’t need to breathe, eat, or drink, and it doesn’t age. Divination spells can’t locate or perceive the target.
The bound target shrinks to a height of 1 inch and is imprisoned within the hourglass, or an item of great worth, such as a gemstone or phylactery, you are touching. Light can pass through the object normally, but nothing else can pass through, even by means of teleportation or planar travel. The object the creature is trapped in can’t be cut or broken while this effect remains in effect. 
While concentrating on this effect you can specify a condition that will cause the spell to end and release the target. The condition can be as specific or as elaborate as you choose, but the GM must agree that the condition is reasonable and has a likelihood of coming to pass. A dispel magic spell can end this effect only if it is cast as a 9th-level spell, targeting the hourglass or the valuable object used. 
If you use this feature again, the previous target is immediately freed from its binding. After using this feature you can’t use it again for the next 2d6 days.