Spike Roller

Link encounters Rolling Bones just before the boss in Tail Cave. To defeat him, use Roc's Feather to jump over the spiked roller that he pushes in your direction. Then attack him with your sword as many times as possible before he can get back behind the large roller. Repeat the process until he is defeated.

Defeating Rolling Bones will open the way to the boss, Moldorm and open a warp back to the entrance of the dungeon.