This amulet is carved from black horn and it’s centerpiece is a brilliant black opal that never feels hot, nor cold, to the touch.
To attune to this amulet you must endure its effects for at least 4 rounds without falling unconscious. Once attuned however, you can breathe while wearing it, and as a bonus action can activate or deactivate it’s Void’s Grasp effect.
Void’s Grasp
Creatures that end their turn within 5 feet of the amulet must succeed on a DC 14 Constitution saving throw or begin suffocating. Suffocating creatures can survive a number of rounds equal to their Constitution modifier before they drop to 0 hit points. This effect ends when the creature starts its turn farther than 5 feet from the amulet, or when it drops to 0 hit points. Creatures that do not need to breathe are immune to this effect.
This pale armor is frigid to the touch, and even in the warmest weather has a thin layer of frost over it. The wearer must endure wearing the cold plate for an entire hour to attune to it. You have a +1 bonus to AC while wearing this armor. Additionally, you have resistance to cold damage, and are unaffected by temperatures as low as -40. A chilly draft follows you wherever you go and while you are conscious any hostile creature that ends their turn within 5 feet of you takes 1d10 cold damage.