Metabot's Manual of Magical Maneuvers

Toxic Grip

1-level Transmutation

you harness your spellcasting to magically sequester poison into your hands. Until the spell ehnds, you can use your bonus action to have poison flow onto any melee weapons you are holding. A creature you hit with a poisoed slashing or piercing weapon takes an additional 1d4 poison damage.
The poison lasts for the duration of the spell. If this spell is cast as a ritual, its duration is increased up to 1 hour.