Mortiferous Pulse

2nd-level biomancy*

Casting Time: 1 action
Range: Self (50-foot line)
Components: V, S, M (a dead animal)
Duration: Instantaneous
Class: Druid, Warlock

You summon a bolt of negative energy to stimulate and transmit necrotic pathogens into those that stand before you, decaying their internal viscera. Each creature in a 5-foot-wide, 50-foot-long line extending from you must make a Dexterity saving throw, taking 3d8 necrotic damage on a failed save, or half as much damage on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for each slot level above 2nd.

*can be replaced with necromancy
Source: Heliana's Guide to Monster Hunting