Blood Magic Tome Part 2 (Casters)

The following chapters delve more and more into actual details casting of spells while using blood magic, including an entire section, coupled with illustrations, of how to use a cantrip known only to the witch covenant; bleed (Bleed's effects are located in ch 1).

After careful study and some time spent actually practicing the motions yourself, you are able to master Bleed. On top of its effect, it now has another function; you can cast the cantrip as a bonus action on yourself to bloody yourself, which causes your current hit points to drop to half of your total hitpoints, rounded down. Bleed does not count towards your maximum amount of cantrips known.

Following your practice and study, you set your sights on trying to master some of the more complex spells of the blood witches and apply yourself to learn how they consume their own life force over physical materials, but it seems much more study will need to be put forward before this is possible. (Reading the book 3 more times for 8 hour sessions will finish the tome).