Northern Waters

3rd-level transmutation
Casting time: 1 action
Range: Touch
Target: Water you can see that can fit in a 60-foot cube
Components: V S
Duration: 1 hour
Classes: Sorcerer, Wizard, Druid
Subclasses: --

You touch a body of water and imbue it with the icy cold of the far north. You choose an area of water that you can see within range and that fits up to a 60-foot cube. Creatures take 1d4 cold damage for every 5 feet of movement in the water.