Ancient Core

The source of Hope's life force and magic.
Void Blood 
Your core is the source of your life, marked with a strange ancient symbol, powered by dark energies and the origin of your magic, it grants you access to a special ability. 
Takes the form of a slender humanoid composed of a similar viscous black substance to what you have in place of blood. Primary 
Ability: For a number of times equal to your proficiency bonus per long rest, you may forego dealing damage with an unarmed strike from Void Blood to force the successfully hit creature to attempt a DC 8 + your Spellcasting Ability Modifier + your proficiency bonus Wisdom saving throw. On a fail, you can turn one of their skill, or individual weapon, or armour type proficiencies, 1 feature, ability, magic slot up to half of your level (rounded up), or up to 24 hours of memory into a small black stone. On a success, nothing happens. Unless re-inserted, a small black stone will last 3 days before dissolving. 
Secondary Ability: As an action can deal a 1d6 unarmed strike or channel touch range spells, and can move up to 15ft away from you, any damage inflicted upon Void Blood is halved onto you.