Gleam Glacier 6-6
From the Super Mario Wiki
In the boss battle, Blizzaurus is completely encased in ice, and the player will need to use the Rage vibe to melt it, to deal damage to Blizzaurus. After the second hit, Blizzaurus may start creating icicles before charging, giving the player less room to avoid it. After the third hit Blizzaurus will transform into her real form, a fairy, and will create some icicle platforms, which can be destroyed for crystals. Like in its previous form, the player needs to destroy Blizzaurus's ice protection to damage it, after two more hit Blizzaurus is defeated.