The Lava Release: Melting Apparition Technique, utilised by Mei Terumī through her unique Lava Release, manipulates a strong acidic mud flow, even capable of corroding flesh. Mei changes chakra inside her body into a powerful acidic fluid that will melt anything and spits out the viscous fluid from her mouth. Both the shape and the amount are determined by her. By spitting it out at short-range the technique's speed increases. By distributing the liquid across a vast range, she creates an acid wall. Anything that touches it will crumble and lose its shape. Should her initial attack miss, a great deal of smoke is created by the effects of the acid, so a follow-up attack can be conducted while the enemy's vision remains obscured.
The phrase "Melting Apparition" (溶怪, Yōkai) is a pun on the Japanese words "apparition/demon" (妖怪, yōkai) and "dissolution" (溶解, yōkai).
In the anime, up until Mei's fight against Black Zetsu, this technique was depicted to look like lava. In later appearances, the substance produced by this technique appears closer to its manga depiction in both colour and texture.