Some guy called Hekaton. I can't remember much about him, but it seems he was quite an easy boss. Pretty much so easy that for a while, I was thinking that the dungeon didn't have a boss, but looks like my memory wasn't entirely correct.
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Hekaton is actually pretty tough (or, whatever the name of the Titan-type enemy is that's the boss of that dungeon), at least to me. The second Titan-type enemy in the Ancients' Labyrinth was the super-easy boss to me. Well, I remember one of them being really difficult and one being really easy.