Electrify Water

Crackling electricity arcs from your fingertips into a contiguous area of water within range, electrifying it for the spell’s duration. The affected area can be no more than 25 feet in any dimension but can be any shape you choose.

When a creature enters the affected area for the first time on a turn or starts its turn there, the creature must succeed on a Constitution saving throw. On a failed save, a creature takes 4d6 lightning damage, and it can't take reactions until the start of its next turn.