You have learned the forbidden art of blood magic. When you take this feat you learn one cantrip and one level 1 blood magic spells and one for each level for which you already have spell slots. As an action, you may activate Blood Magic. While active, you may cast spells without expending spell slots, instead expending 1 hit die per base level of the spell (a level 2 spell costs 2 hit die). You may end your Blood Magic with a bonus action, or by falling to 0 hp. While blood magic is active, you may not be healed except by blood magic.
Casting at Higher Levels: When you increase the level of a spell, you add additional dice to the damage. Increase by one level you add 1d6. By 2 levels you add 1d8. 3 levels = 1d10 and 4 levels = 1d12. Beyond this, you may not increase the level. You may exceed your own spell slot levels by 1, up to 8th level. Exceeding your known levels in this way doubles the damage you take to cast the spell. So a 3rd-level spell, cast at the 5th level would cost 3 hit dice +1d8 (or +1d10 if you cast at the 6th level instead).
Learning spells: Any time you gain a spell slot, you may learn one spell from the Blood Mage list of that level. Additionally, any time you learn at least one blood magic spell you may replace one you already knew with a different spell. Magic cast this way is immune to any spell or anti-magical effects except the Litany of Adrala.
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