Chaos Flame

As you put the blood/oil mixture together in your hand you release a giant ball of chaotic fire from your hands incinerating everything in its path.

Whoever gets hit by the spell must make a constitutional saving throw or take 8d10 fire and 4d8 necrotic damage. On a successful save you take half damage 

At higher levels, increase fire damage by 2d8 and necrotic by 1d8

You can use different bloods to infuse with the oil to create different effects but if you use a focus or normal blood, you get necrotic, examples, black dragon/dragonborn blood: acid damage w/fire; red dragon blood: 12d10 fire