Tsoúchtra's Touch

You evoke murky-blue mist on the tip of your finger. In a brief moment, hazy jellyfish's tentacle shoot out of your finger tip, toward a creature within range. Make a ranged spell attack against the target. On a hit, it takes 1d8 poison damage, and its speed is reduced by 5 feet until the start of your next turn.

The spell's damage increases by 1d8, speed reducing increase by 5ft when you reach 5th level (2d8) (10ft), 11th level (3d8) (15ft), and 17th level (4d8) (20ft).