The cube can hold 1 Large or 4 Medium/Small creatures. It may move through creatures if it has room inside them. Creatures whose space it enters make a DC 12 Dex save.

Failure: 3d6 acid damage and Engulfed. Engulfed creatures are Restrained, have Total Cover, can’t cast spells, take 3d6 acid at the start of the cube’s turn, and move with it.

An engulfed creature may use an Action Point to make a DC 12 Str save to escape.

Success: The creature moves to a space within 5 ft. of the cube.