Fallen Warpgrafter

Caster level 5, proficiency in Arcana, being part of a group with the knowledge of the technique or having access to a teacher.

You can grow and graft the tissue and body parts of aberrant creatures onto others, granting the recipients of your grafts new, potent abilities.   Benefit. You can create and attach any eldritch graft whose prerequisites you meet. In addition, you know what tissue you can harvest from any abomination you see and know, and have an idea as to what the resulting grafts may bring.
A character with at least two eldritch grafts gains advantage on saves against psychic attacks or charming. A character with three grafts gains resistance against psychic and charm damage. Once the character receives their fourth graft, they become immune to psychic attacks and charming altogether, and there are no further bonuses for the fifth graft aside from what abilities the fifth graft gives on its own.