Enemy list
Chest list
You have the Goddess's Bell. Josef's dead. Time to get the Sunfire from Kashuan Keep and destroy the Dreadnought. 11 chests in the keep.
Journey to Kashuan Keep
Go to Poft's pub. Talk to Cid's assistant at the far right table and book passage to Kashuan Keep. The airship drops you at the fortress entrance.

Kashuan Keep
Kashuan Keep has 5 floors, 11 chests, and one boss. Rest up outside before you enter.
Inside, a magical flame blocks the path. Use the Goddess's Bell on the door behind it to unlock the way forward.

Past the door, you'll meet Gordon, prince of Kashuan. He came for the Sunfire himself but couldn't proceed; he lacks Egil's Torch, a relic needed to carry the flame. Gordon joins as your fourth member. He starts with a spear and shield but has low weapon proficiency, so he won't hit hard initially. Give him spare gear and he'll level up as you go.

Enemies are undead and beasts. Ogres hit hard; use Protect. Ogre Mages cast Sleep 4 and Blizzard 5, so kill them first. Ghouls and Ghasts inflict Paralysis but are weak to Fire. Shadows and Wraiths have high evasion, so magic works better than physical attacks.
1F. Follow the path. In the next room, go south to the bottom right corner for chest 1 (Cure Tome). Head back up, go left. Ignore the door. Continue south to the stairs.
2F. Go right, then down. Continue right to the end, then up for chest 2 (500 Gil). Follow the path around to the stairs.
3F. Head left into the statue room. Three paths lead south; the first is a dead end. Take the second one. Chest 3 (Golden Shield) is a monster chest with 5 Wererats. They can Poison but aren't dangerous. Double back, go right, then down to the stairs in the top right.
4F. Go left. At the fork, head south to the first door. Inside: Mythril Axe, Werebuster, and Mythril Sword. The Werebuster shreds Werebeasts; solid upgrade if you're fighting undead. Exit, go up, veer left past the door, then south to 5F.
5F. Go up and right. Push south. See the chest near the middle? That's chest 7 (Golden Armor), and it triggers a fight with 4 Mines and 2 Balloons.
Head right and north to the door in the top right. Inside: Mallet, Antidote, and Eye Drops. Leave, go south, then left at the split. Follow the stairs down; you'll find Red Soul waiting in a room below.
Boss: Red Soul
Red Soul guards chest 11 containing Egil's Torch.
After the fight, grab Egil's Torch from the chest behind it.
Obtaining the Sunfire
Use Teleport to exit (or walk back). Re-enter Kashuan Keep and head to the flame at the entrance. Use Egil's Torch on it to capture the Sunfire.

As you leave, a cutscene triggers. The Dreadnought flies overhead, attacking an airship.
Chocobo Forest
Before heading to Altair, go south from Kashuan Keep through the forest. Look for a small clearing between the trees. That's the Chocobo Forest.

Chocobos let you travel faster with no random battles. They return to the forest when you dismount or enter a town.

Return to Altair
Take the path northeast through the mountains toward Poft. Cid's airship isn't available; it was captured by the Dreadnought. Take the ship from the pub dock to Paloom, then Canoe southwest to Altair.
In the rebel hideout, you learn Hilda has been captured. She left Altair to meet up with you and was aboard Cid's airship when the Dreadnought attacked.

Find Minwu upstairs tending to the King. Ask about Dreadnought. Hilda and Cid are prisoners aboard it. Next step: infiltrate the Dreadnought, rescue them, and use the Sunfire to destroy the engine.