Chasm

When you cast this spell, a giant chasm appears in the ground, letting all creatures that were on top of it before,  fall.

After casting the spell, a pit with a 10 ft circumference appears within range. The pit is 50 feet  deep and remains until concentration ends, in which the barrier keeping the ground from falling in is removed.

When this spell is cast at a higher level than 5th, increase the pits depth by 10 feet.

(For reference, every 10 feet you fall you take d10 damage)