Fire Form. The elemental can move through a space as narrow as 1 inch wide by squeezing. A creature that touches the elemental or hits it with a melee attack while within 5 feet of it takes 1d10 fire damage. In addition, the elemental can enter a hostile creature's space and stop there. The first time it enters a creature's space on a turn, that creature takes 1d10 fire damage and catches fire; until someone takes an action to douse the fire, the creature takes 1d10 fire damage at the start of each of its turns.   Death Burst. When the lava elemental dies, it explodes in a burst of fire and magma. Each creature within 10 feet of it must make a DC 11 Dexterity saving throw, taking 2d6 fire damage on a failed save, or half as much damage on a successful one. Flammable objects that aren't being worn or carried in that area are ignited.   Illumination. The elemental sheds bright light in a 30-foot radius and dim light in an additional 30 feet.   Water Susceptibility. For every 5 feet the elemental moves in water, or for every gallon of water splashed on it, it takes 1 cold damage.