Ikkaku refuses to use his full power to keep his Bankai a secret.

Ikkaku emerges victorious but heavily wounded. Despite the win, he is frustrated that he had to reveal his ultimate trump card. He swears Yumichika to secrecy, as Ikkaku wishes to remain a Lieutenant under Kenpachi Zaraki rather than being promoted to Captain.

In Episode 118, "Ikkaku's Bankai! The Power That Breaks Everything," the battle for Karakura Town reaches a fever pitch as the Soul Reapers face off against Grimmjow’s invading Fracción. Bleach (Dub) Episode 118

Unlike most sleek Bankai, Ikkaku’s is a massive, three-sectioned weapon connected by heavy chains. It lacks special abilities like kido or ice; it is a weapon of pure, brute force. The Clash of Giants

Edrad releases his Zanpakutō, Volcanica , transforming into a lava-spewing giant. The Turning Point Ikkaku refuses to use his full power to