Putrefy

Putrefy
Feat
Prerequisite: Level 4

You gain the following benefits.
Necrosis.
When you make a damage roll that deals Necrotic damage, you can cause one creature taking that damage to have the Poisoned condition until the start of your next turn. Once you use this benefit, you can't use it again until you finish a Short or Long Rest.

Source: Astarion's Book of Hungers (ABH), page 10