Blood Draw

1st-Level Transmutation Spell (Sorcerer, Warlock, Wizard)

Casting Time: Reaction, which you take when a medium sized create dies within range
Range: 60 feet
Components: V, S
Duration: 1 minute

When a Medium sized creature that bleeds dies within range you may use your reaction to draw 8 blood masses from its corpse.

Source: Champion's Ascension