can you show me your Blood Mage model? Is he use life to cast spell or use blood effect? Btw, that is a interest idea. You can make an ability like make a enemy bleed over time until it attack BM. Or you can make an ability like blood shield. BM will use percent of his blood to transform it to a blood shield. When it active, BM heals for 25% of all damage dealt (reduced to 10% for AoE damage).
Something like that
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