You have to get wet to get in. If you follow the moat along the left side of the castle, you will find an open grate in the floor of one of the stone rooms. You swim down through a passage, and you'll find a lever that opens another grate above you. After gulping some air, you can make your way around the back of the ruins where you can enter through a section of wall that has crumbled.
Serath
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