Lineages

Lineages, like Custom Lineage, assume the player is developing a character that is at its base a Human. However, unlike Custom Lineage, these Lineages assume something dark and twisted may have happened to the player character, or perhaps the player character might be evil or corrupted. At any rate, an NPC who discovers the true nature of a character with a Lineage may become Horrified and start a riot or a mob. 
For variations, work with your game master. Lineages follow the rules in Van Richten's Guide to Ravenloft. A subscription or purchase may be required to view that link.
Granny Water Mother was a Hexblood until she killed and devoured her mothers heart and stole her power over water.

Lineages on dndbeyond.com. A subscription or purchase may be required.