You create a rune on an unoccupied tile within range. Your opponents cannot see the rune and if they step on it, it will explode upwards into a spire of jagged ice. The creature takes as many d8s of water damage as your Hydromancer level + 2 and is frozen for a turn.

Scaling: d8 water per Hydromancer level

In combat: Once per combat · Out of combat: Once per hour