How deep a hole can you actually dig with Mold Earth, before having to start playing Dirt Tetris? If its cast on one spot, then cast again on the bottom of the resulting hole, does it still excavate up to the surface?it would, but then might fall back – spell specifies dirt only moves 5 feet, so it would rise to the top of the first cube and then fall. Would have to dig out a broader pit to go deep.
— Mike Mearls (@mikemearls) December 4, 2017
not quite Mike. you can have 2 of the spells working at once. because it specifies up to a 5′ cube of rock or stone, make one spell move the 5’x5’x5′ earth and have a 5’4″ x 5’4″ X a few inches thick slab of stone being moved for the second effect. because of geometry, a therorectical 5’7″X5″7″ plane could fit inside a 5′ cube. now the stone wedges itself into the dirt walls stopping the loose dirt from falling. raise both up 5′ and drop them again. No need to do the strip mining staircase, use the stone elevator method.