This is the floor where things get interesting. There is a Behemoth waiting as you cross the single-square bridge to the north. Behemoths are tough, but they can be beaten easily if you're patient. The key is realizing that they only counterattack. Use physical attacks and Blink to take them down without fuss.
You should also watch out for the enemies here. Ds.Bone have ridiculous Magic Defense like Karies combined with a huge HP total, but Stone can kill them instantly. King-Ryu like to spam Blitz, which deals either 1/2 or 1/10 of the target's max HP in damage, and counterattack by Paralyzing people. It's generally a dangerous place.
You should also watch out for the enemies here. Ds.Bone have ridiculous Magic Defense like Karies combined with a huge HP total, but Stone can kill them instantly. King-Ryu like to spam Blitz, which deals either 1/2 or 1/10 of the target's max HP in damage, and counterattack by Paralyzing people. It's generally a dangerous place.