Hemomancer Feat

Prerequisite: Spellcasting or Pact Magic Feature

• You can sacrifice your essence to cast spells with the Blood Magic tag that you have in place of expending a spell slot. To do so, sacrifice 5 hit points per level of the spell. These hit points sacrificed can count towards the hit point cost of the blood Material component of the spell.
• You can cast a total number of spell levels in this manner equal to your character level, but casting a spell of 6th level or higher this way drains your vitality in a more profound way unless it has the blood magic tag, causing you to gain levels of exhaustion equal to the number of levels over 5th the spell is (1 level for a 6th level spell, 2 for a 7th level spell, etc).
• You cannot cast spells over 5th level this way while you have any levels of exhaustion. The total number of spell levels you can cast in this manner resets when you take a long rest.

Source: KCLL, page 282

Blood Magic Spells:

• Click here for the spell list. Make sure to put the tag Blood Magic in the search bar to bring up spells that work with this feat.