Enemy listEnemies
Chest listChests
The real Hilda is a prize in the Emperor's arena. The Lamia Queen was a decoy; Gordon's back in the party, and the Coliseum sits deep in the eastern desert. This chapter has 4 chests, 9 new bestiary entries (2 missable), and one boss.
Sailing to the Coliseum
Board your ship and sail east toward the gap between the landmasses, then south and east again. Dock on the coast and walk through the desert. Antlions (370 HP, 50 ATK) and Land Rays (450 HP, 40 ATK) roam the sand; both are missable, so fight at least one of each for the bestiary before entering.
The Coliseum is in the eastern part of the desert, just south of a large structure. Chimeras and Adamantoises also roam the sand alongside the missable enemies, so the fights here aren't trivial. Heal up before heading inside.

The Arena
Head inside and walk straight north toward the gate. The Emperor appears and announces his entertainment. Save before approaching; the boss fight starts immediately.

Behemoth
The Behemoth (2,000 HP, 90 ATK, 65 DEF) only uses physical attacks, so Protect cuts its damage significantly. Berserk on your strongest attacker speeds the fight up. Physical attacks need high weapon levels to connect consistently; magic works but needs high spell levels to deal meaningful damage against 65 DEF.
After the fight, you're captured and thrown into cells below the arena.
The Cells
You wake up in a cell on B2. Walk to the iron gate and Paul shows up, the thief from Fynn. He knocks out the guard and frees you. No random encounters on this floor, so take your time with the chests.
All four chests are on B2. From your cell, head east and then north for Chest 1 (Antidote); it's a monster chest guarded by Stalagmites (240 HP, 40 ATK), Dual Deads (300 HP), and Dual Heads. Double back toward your starting cell, go up, take the first right, continue up, then right again. Chests 2-4 (Ether, Elixir, Cottage) are all in one room behind the door.
Follow the path around toward the top right and take the stairs up to B1. Random encounters resume here, and the enemies are tougher than anything in the arena. Wizards (540 HP, 190 MP) cast high-level black magic and Parasites (300 HP, 35 ATK) show up in groups. Keep your HP high between fights.
Follow the corridor until you reach three cells. Hilda is in the rightmost one.

Gordon takes Hilda and leaves. Head left and up the stairs to work your way back to 1F. Teleport doesn't work inside the Coliseum, so you'll walk the entire way out.
Return to Altair
Sail back to Altair and rest at the Inn. Stock up on Antidotes and Potions if you're running low; Gatrea is also nearby if you need a second shop. Talk to the guard at the entrance and he'll direct you northwest to the Rebel Camp, where the rebels are preparing to assault Castle Fynn.

Rebel Camp
From Altair, go northwest across the land. The Rebel Camp is a short walk; only Hornets and Leg Eaters spawn out here. Inside, talk to Hilda and Gordon to learn about the plan. And once you've spoken to both, leave and canoe north across the water to Castle Fynn.