hey i went into the Saronia Catacombs cave place underwater, and I got to the boss guy Odin (he's gold-ish and riding a horse). Well, before I talked to him to fight, I noticed a wall to the right and i could see a treasure box on the other side. How do I get to it? I tried to find some secret lever in the candles nearby and i also tried going into the walls for secret hallways, but nothing worked. Please help!