Board Thread:Questions and Answers/@comment-31410890-20181109181859/@comment-6050823-20181110075050

You're breaking its beard before the final area, right? That is a vulnerable part of its body that needs to be broken on Ceadeus before it can enter the final area of the Underwater Ruins.

This is the Great Sword you're using? Maybe you could upgrade it one more time if you're having trouble with Ceadeus.