When you reach the corner of the pathway, head east through the wall to find a secret Treasure room. Be warned, all eight chests are guarded. The boss, Odin, is incredibly powerful, so you may want to Teleport out and save after collecting all the Treasure in the catacombs. Your Evoker can't summon him until level 30 anyway, so don't press it.
Technically, Odin is in the basement of Saronia Castle, but you can't go anywhere after fighting him, so he's included here for convenience. Odin has a very powerful attack called Zantetsuken which he will use quite often. It deals massive damage to the entire party, and you'll be hard-pressed to knock off 7,000 HP before he manages to finish you off with it. The same Dragoon trick you used against Garuda can be effective (though costly in terms of CP), but you might just want to come back when you're a bit more powerful.
Technically, Odin is in the basement of Saronia Castle, but you can't go anywhere after fighting him, so he's included here for convenience. Odin has a very powerful attack called Zantetsuken which he will use quite often. It deals massive damage to the entire party, and you'll be hard-pressed to knock off 7,000 HP before he manages to finish you off with it. The same Dragoon trick you used against Garuda can be effective (though costly in terms of CP), but you might just want to come back when you're a bit more powerful.