Enemy list
Chest list
Time to rescue the real Princess Hilda from the Empire's arena. Gordon's in your party, the ship is ready, and the Coliseum sits in the desert on the eastern continent. 4 chests inside.
Sailing to the Coliseum
Board your ship and sail east. The Coliseum is on the eastern continent, surrounded by desert.
Dock somewhere close to the passage between lands and walk the rest of the way. The Coliseum is hidden in the eastern part of the desert.

The Arena
Head inside the Coliseum and walk straight up toward the gate. The Emperor shows up and announces the entertainment.

The gate opens and a Behemoth charges out.
After the fight, you head back to the gate. The Emperor springs a trap and has you taken to cells below.
The Cells
You wake up in a cell in the bottom right corner of the map. Walk to the iron gate and Paul shows up, the thief from Fynn. He knocks out the guard and frees you. Time to find Hilda.
The cells span two floors. B2 is where you start; all four chests are down here.
Chest 1 (Antidote) is at the end of the right corridor, then up. This is a monster chest, so be ready for a fight. Dual Deads, Dual Heads, and Stalagmites can all appear as chest encounters in this area.
Chests 2, 3, and 4 (Ether, Elixir, Cottage) are in a room further in. Double back toward your starting cell, go up, take the first right, continue up, then right again and open the door. All three chests are inside.
Follow the path around toward the top right and take the stairs up to the next floor.
On the upper floor, follow the path until you can see three cells. Hilda is in the rightmost one.

Gordon takes Hilda and leaves your party. Make for the stairs on the far left of this floor and walk back out the way you came in.