Iwamodoki

Iwadomoki (イワモドキ in Japan) is a badnik from Sonic & Knuckles found found lying under rocks in Lava Reef Zone. They lurk in waiting until Sonic approaches, then flashes briefly and explode, sending parts of themselves in varius directions as projectiles. The badnik cannot be destroyed by Sonic, so it's best to just get out of the way of the projectiles, though they will bounce harmlessly off any shield currently active.

Trivia

 * Iwadomoki means "pseudo-rock" in Japanese.
 * Although this Badnik blows itself up, its organic battery comes out unharmed and flies away.