Voidplague

1st Level Spell
Magic Type: Necromany
Ignisarian Classification: Black Magic

You inflict a destructive decay on a creature, causing it to to begin to decay. For the duration of the spell, every time the creature takes damage, it takes an additional 1d4 necrotic damage, and the effect of all healing on the creature is reduced by half. The target creature has disadvantage on any Charisma ability checks during the effect of the spell.

At Higher Levels: When you cast this spell using a spell slot of 2nd level or higher, you can target an additional creature and the the damage increases by 1d4 for each slot level above 1st.