Unseelie Solitaire

Ring, very rare (requires attunement by a spellcaster)

This thick band of white gold bears a solitary ice-blue diamond sparkling in a setting. No matter the surrounding temperature, the unseelie solitaire remains cold to the touch, as does your hand. Three times per day you can freeze the blood of a creature you touch as a melee spell attack dealing 2d8 cold damage. The target also must make a DC 16 Constitution saving throw or be slowed (as the slow spell). The target can make a new Constitution saving throw each round at the end of its turn to end the slow effect.

If you hit the same target with this effect again while it is already slowed, it becomes paralyzed if it fails a DC 16 Constitution saving throw. If paralyzed, a successful saving throw reduces the effect to slow.

If you hit the same target when it is already paralyzed, its body is turned to solid ice if it fails a DC 16 Constitution saving throw. This is the same as being petrified but cannot be reversed by stone to flesh; however, remove curse or greater restoration can end the effect.

A fey creature or Small or smaller humanoid wearing an unseelie solitaire can change their appearance (as disguise self) to resemble an icy-skinned wintry version of a faerie creature, and can choose to make their alignment show up as evil for the purpose of detect evil and similar spells. This does not change the wearer’s actual alignment.