Delthorns Aura of Blight

A small area of death and blight radiates in a 10-foot radius around you.  Until the spell ends, the aura moves with you, centered on you. Each hostile creature in the aura takes 3d12 necrotic damage, and its hit point maximum is reduced by 1d10. In addition, all spell attacks on a creature within the Aura are at advantage and any attacks that deal necrotic damage deal an extra 1d12 necrotic damage.

All plant life wilts and dies and if a creature is made of vegetation or plants critical hits are automatically between 17-20 on every attack while they are in the aura.