Geyser Blade

You brandish the weapon used in the casting of this spell and make a melee attack with it against one creature within the weapon's range. On a hit, the target suffers the weapon attack's normal effect and a small geyser forms underneath the target. If the target does not move at least 5 feet from this spot before the start of your next turn, they take 1d8 cold damage as the geyser erupts under them.

This spell’s damage increases when you reach certain levels. At 5th level, the attack deals an extra 1d8 cold damage to the target on a hit, and the damage the target takes for not moving increases to 2d8. Both damage rolls increase by 1d8 at 11th level (2d8 and 3d8) and again at 17th level (3d8 and 4d8).