Enemy listEnemies
Chest listChests
The final stretch. Five remaining chests, the last sealed weapon, and Zeromus. Every enemy on B8-B10 is boss-tier, including Behemoths as random encounters. Save constantly and keep the party healed at all times. The nearest save point is back on B7, so use quick saves liberally.
B8: Masamune
Wicked Mask (37,000 HP) starts appearing here. It casts Reflect on itself and your party, then spams Flare off the Reflects. Head down the east stairs, then west for a Fuma Shuriken (338/342). Continue south to the bottom-right corner where the final sealed weapon sits. Heal up and quick save.
Reward: Masamune, the best katana. Equip it on Edge.
B9-B11
B9. Head down the stairs and open the chest for an Elixir (339/342). Follow the linear path south for a Gysahl Whistle (340/342). Continue east to the warp pad.
B10. Head south down the stairs. Open the east chest for a Fuma Shuriken (341/342). Cross to the west side for the final chest in the game: another Fuma Shuriken (342/342).
Continue southeast to the warp pad. B11. Two new enemies: Zemus's Mind (20,000 HP, immune to physicals) and Zemus's Breath (40,000 HP, immune to magic). Mind requires Flare or Holy to kill; Breath requires physical attacks. But here's the good news: Zemus's Breath is completely docile and gives 8,400 EXP per character with minimal effort (the best grind spot in the game). Farm here if you need levels. Use Sirens to guarantee Breath encounters. Level 60+ is recommended for the final boss, but you need level 70 on all characters for the related trophy.
Follow the linear path south to the warp pad. Step on it to reach B12.
How to beat Zeromus
A scripted battle plays between Golbez, FuSoYa, and Zemus. Then Zeromus rises from Zemus's hatred. Another scripted scene follows. When you regain control, open the Items menu and use the Crystal on Zeromus to reveal his true form. The real fight begins.
Zeromus has no listed weakness. His main attacks are Big Bang (heavy party-wide damage), Bio and Flare (counters to magic), Meteor (hits 2-3 characters hard), Wall (drops HP to single digits), and Black Hole (removes all buffs). Rosa needs to cast Curaja almost every turn. Cecil attacks. Kain Jumps. Edge throws the Knife first (9,999 damage), then every Fuma Shuriken you've been saving, then any weapons you don't need. Rydia summons Bahamut for consistent 9,999 with no counter risk.
After the battle, enjoy the ending. Save when prompted; you'll load outside the Crystal Palace and can continue cleaning up hidden summons, the Pink Tail, and the level 70 trophy.