Tidal Eruption

You slam the ground beneath you causing a violent explosion of water in a 50 foot radius around yourself, filling the area with water that has a depth of 10 feet. Any creature caught within the initial radius must make a Strength saving throw or be knocked to the ground becoming prone and taking 6d6+10 bludgeoning damage.

As the water rises in the area summon 1d8 Giant Octopus that will attack enemy targets. Finally, summon 4 giant tentacles that will attack targets besides the caster within the radius of the spell.

Tentacle Attacks:  Targets that enter the radius of the spell on their turn or begin their turn within the radius must succeed a Dexterity saving throw or take 6d6 damage and become restrained by one of the tentacles. Restrained creatures may not be targeted by other tentacles, and must perform a Strength check against your spell save DC to free itself, failing the Strength check will result in 4d6 bludgeoning damage.