Clubberskull

Clubberskulls (デススカル Desusukaru, "Deathskull") are Underworld enemies that debuted in Kid Icarus: Uprising.

Physical Appearance
When inactive, the Clubberskull is a large, horned skull bound by glowing blue chains. A heart with a single red eye can be seen within the skull's jaw, struggling to break free.

When active, the heart inside its jaw grows and breaks its skull in half, revealing its grotesque body. It has two massive arms—the red arm holding onto the top half of its skull and the purple arm holding onto the lower half—and arteries protruding from the top of its body.

Kid Icarus: Uprising
The Clubberskull typically remains dormant until attacked, to which it transforms and becomes extremely aggressive in nature, capable of mowing down its own allies in order to reach its target.

When it first awakens, it lets out a massive roar, which emits an orange shockwave surrounding it that harms foes. Afterward, it relies solely on using its arms for combat, which it will achieve by stomping toward its foes or spinning itself into them.

Super Smash Bros. for 3DS/Wii U
Clubberskulls appear as enemies in the multiplayer feature Smash Run. Defeating them grants the player a large amount of power-ups.

Trophy Information
''These enormous beasts armed with giant skulls are usually kept locked up, but you can set them free just by attacking them. We should mention, though, that you can't grab or launch them and they're super powerful. What? You already released it? Defeat it, then, and earn lots of stat boosts and prizes!''

Clubberskull
''Clubberskulls possess unrivaled attack strength capable of destroying even high-level monsters. Because of this threat, they are normally sealed away, only attacking if disturbed. Leaving them alone is an extremely valid strategy.''