Warhammer Fantasy

The caster strikes the floor with their weapon or staff. A low rumbling starts, rising to a crescendo as a huge crevasse opens in a place and orientation of the caster's choice, within 140 yards. The crevasse is 9 yards wide, 30 feet deep, between 100 and 500 feet long. Anyone on the area of the crevasse when it opens, as well as vehicles such as coaches and horses, will fall in automatically taking 3d6 fall damage. Those on the edge of the crevasse (within 5 feet) must succeed a dexterity saving throw or fall in. The crevasse will close up within 5 turns, and those inside will perform a strength saving throw. Suffering 8d6 bludgeoning damage, and being buried alive on a fail, or half as much and manage to claw their way up on a success. those buried alive begin suffocating immediately (Normal suffocation rules), though a creature may chose to forego the strength saving throw to take a breath before the crevasse closes. Clawing out requires repeated strength saving throws.