Blanche's Bile Bomb

A sphere of boiling bile appears in a 30-foot-radius you point too. Creatures within this radius must make a constitution saving throw or be poisoned. Creatures within this radius must make a dexterity saving throw or take 6d6 Necrotic damage.
Creatures that die to the effects of this spell are raised as Zombies under your control. 

At Higher Levels. When you cast this spell using a spell slot of four or higher, the damage of this spell increases by 1d6 for each spell slot level above three.