Campaign: Dungeons of Drakkenheim
Researching the Spell: A character who can cast 6th level spells can research Ray of Contamination. To complete the research, the caster must spend 12 days of downtime and 600 gp.
Contaminated Spell: When you cast this spell, you gain one level of contamination.

An octarine ray springs from your pointing finger to a creature that you can see within range. The target must succeed on a Constitution saving throw. On a failed save, a creature takes 16d6 necrotic damage and gains 1d4 levels of Contamination. On a successful save, a target takes half as much damage and does not gain any contamination levels.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, you can target one additional creature for each slot level above 6th. The creatures must be within 30 feet of each other when you target them.