Eye that is of pitch black colour and bloody red iris that almost lures blind or eyeless folk closer

When attuned to the eye and placed into an eye socket where used to by eye it functions as a normal eye

When attuned the Eye grants certain demonic powers

 - you gain darkvision to range of 60ft
 - you learn Abyysal language
 - you have pool of 6 charges and regain 1d6 charges at end of a long rest

You can use your charges in following ways 
 - Demonic resistance : as bonus action you use 1 charge to gain resistance to two damage types of following list up to 1 minute ( Cold, Fire, Lightning, Poison)
 - Demonic servant : as action you use 1 charge to summon (in range of 10ft of you where you can see and space cannot be ocupied) a Quasit that regards you as its master up to 8 hours
- Abyssal spellcasting : you can cast following spells by useing charges , your spell save dc for these spells is 16
invisibility (self only) - 1 charge
darkness - 1 charge
fear - 2 charges
detect magic - 1 charge

Notes: Language: Abyssal, Sense: Darkvision