The Ancestral Titan is not powerful enough. The Ancestral Titan is currently in the form of a skeleton, mainly because the Ancestral Titan is not strong enough. The Ancestral Titan was once the first generation of giants and possessed great power, but the current Ancestral Titan is only in the form of a skeleton, and its strength is far from that of the Ancestral Titan. Only the protagonist Allen can fuse the powers of the nine giants to reappear the full form of the ancestor giant.