Bloodstar

Blood Magic. When casting blood magic in addition to expending a spellslot to cast the caster also takes a number of 1d6 equal to the level of the spellslot used as bleed damage.

Blood congeals into a bright star that explodes in a 10ft sphere, each creature within that sphere must make a Constitution saving throw or take 3d8 bleed damage and half damage on a success. Whether they succeed or fail they gain 1d8 stacks of Bleeding from this attack.