Eruption

When you strike the ground, you chose a creature you can see within 30 feet. Magma and molten rock erupts from beneath the feet of the target and it must make a Dexterity saving throw, taking 2d6 fire damage on a failed save or half as much on a successful one.  On a failed save, the creature is restrained by the hardening rock. A creature can make a DC 15 Strength (Athletics) check as an action, freeing itself or a creature within reach from the rock on a success. The rock has AC 17 and 20 hit points, and it is immune to fire, poison, and psychic damage.

At Higher Levels:  When you cast this spell using a spell slot of 2nd or higher, the damage increases by 1d6 for each slot level above the 1st.