Water Octopus

You perform a flowing sequence of movements, calling upon the water around you to form eight octopus-like tentacles that bloom outward around you in a terrifyingly colorful form.

When a hostile creature enters a space within 10 feet of you, you can use your reaction to make an attack with a tentacle against that creature. This attack uses your spell attack modifier and deals 2d8 cold damage on a hit.

After you cast a spell, you can make an extra attack with the tentacles against one creature within 10 feet of you. On a hit, the target takes 2d8 cold damage.