The caster have learned how to store magical potencial in his/her blood.
Instead of spending a Spell Slot to cast a spell, a character with Burning Blood Magic can instead spend and roll Hit Dice to fuel the spell. The caster must reach a result that is x3 the Spell level, chosen before he/she makes the roll. The caster can choose to spend more Hit Dice if the result is not sufficiently high to cast it. If the roll does not reach or exeeds the targeted number, the spell fizzles and the Hit Dice are spent.
Additionally, when a characters Hit Points are less than half its Hit Points Maximum, the character can roll a Hit Dice as a Reaction, dealing the rolled result in Force damage when hit by a melee attack.
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