Swamp Mote

You create a mote of the swamp in the space of a creature within range. Make a ranged spell attack against the creature to assail it with the the darkness of the swamp. On a hit, the target takes 1d8 poison damage. On a critical hit, the target gains the poisoned condition.

This spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).