Dragon's Blood

Inject a sample vial of blood with a highly volatile combustible liquid. When thrown, all creatures within a 20 ft. radius sphere must make a dexterity saving throw against spell DC or take 3d12 fire damage and take 2d4 fire damage at the beginning of each turn for 1 minute, as the flaming blood sticks to them. On a successful save, a creature only takes the lingering 2d4 fire damage per turn.