Fighting Tongue Slash

After focusing Senjutsu chakra to his snaking tongue, Fukasaku will extend it towards his opponent. Because of the natural energy-augmented chakra built up in his tongue, it will become superfast and sharp. The tongue can then easily cut through most foes.

In anime; Fukasaku instead produces a highly pressurized stream of water, from his mouth, that is capable of slicing through even metal.