Tooth of The Wyrm

2nd-level necromancy

Class(es) cleric, wizard

Casting Time: 1 action

Range: Touch

Components: V, S, M (a dragon’s tooth)

Duration: Concentration, up to 1 minute

You make a melee attack to touch a target creature with the material component, and a tiny wound appears that grows larger each round. The target takes 1 necrotic damage when touched, and if you maintain concentration, the target must make a Constitution saving throw each turn thereafter. If the save fails, the creature takes double the damage of the prior round (2 damage in the 2nd round, then 4, 8, 16, 32, and so on up to 512 after 1 minute and nine failed saving throws).

The effect can be removed with lesser restoration.