Anonster

Anonster is one of the bosses that Wario faces in Wario Land 3. It can be found in Out of the Woods, inside of a giant tree. It's the guardian of the last music box.

This boss seems to be a giant spider with three eyes. It also has a circular mark on his back that changes each time it's hit. When Wario reaches the boss, it'll be connected to the roof via its spider-web. It'll spit a blast of web that will turn Wario into a Ball o' String Wario and kicks him out of the battlefield.

To defeat it, Wario has to wait until the web projectile touches the ground and turns into a ball. Wario must grab it and throw it at Anonster to make it fall. When it does, he'll shoot web projectiles at Wario. The player has to ground-pound it to damage it. When done so, the spider will return to the ceiling and repeat its strategy. After receiving enough hits, Anoster will be defeated and Wario can access the final music box.