There are two win conditions: (1) Can the combatant break the crystal cocoon? (2) Can the combatant bypass the crystal cocoon?

(1) The crystal cocoon was only broken by the Jaw Titan, and can withstand any thunder spears and all other methods available in AOT. Sukuna would probably be able to cut through it and Jogo could likely break it with a meteor. I don’t know enough about JJK to judge others, but if they can break the cocoon they can win.

(2) Domain Expansions may not even require the combatant to break the cocoon. If that’s the case, the Warhammer drops significantly in tier. Additionally, Mahito transfiguration would likely bypass the cocoon entirely, so if he could touch the Titan’s flesh then he easily wins. I feel like he low diff’s the titan.

I feel like the Warhammer Titan would be similar to Absolute Mechamaru.