From the Super Mario Wiki, the Mario encyclopedia
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Iwao (岩男, meaning "Rock man") are enemies in Wario Land 4 that only appear in the level Fiery Cavern. They are pudgy but powerful humanoid creatures. Iwao regularly summon big spherical rocks from the ground and throw them in the direction of Wario. The rocks roll along the ground and hurt Wario when they overrun him and eventually shatter when they collide with a wall. Wario is not able to destroy the rocks by himself, but he can avoid damage by ground pounding them. Shortly after a rock has disappeared from the screen, an Iwao summons a new one. When not throwing a rock, they simply move back and forth within a small area and cannot hurt Wario by themselves. However, Iwao are immune to most of Wario's attacks and only stop for a short moment when he touches them. Wario can only defeat an Iwao by dealing a ground pound to the head. If defeated, Iwao release a Silver Coin.