Enemy list
Chest list
Minwu's gone. You need the Goddess's Bell to access Kashuan Keep. Hilda directs you to Josef in Salamand. 13 chests in the Snow Cavern.
Salamand and Semitt Falls
From Altair, canoe across the lake and go past Paloom. Follow the path north; when there's an opening between the mountains, walk northeast towards Salamand.
Find Josef's house in the northeast corner and ask about Goddess's Bell. He explains the Bell is in Snow Cavern, but you need the Snowcraft to cross the snow fields. He hid it in Semitt Falls.

Josef joins as your fourth member. He shows up empty-handed (no weapon, no shield), so equip him with anything spare.
Return to Semitt Falls by going south and west across the lake. Loop around the mountain, hugging it until you find the opening. See the Semitt Falls walkthrough for the full route.
Inside Semitt Falls, walk towards the blue stone and interact with the top right corner. Josef turns a small rock and a secret passage appears. Walk to the chest and collect the Snowcraft. This is the 11th and final chest in Semitt Falls. Exit the dungeon.
From Semitt Falls, go west through the narrow passage on your canoe. Take a right at the ocean and hug the water north until you see a small passage into the snow. Push east across the snow fields until you reach the end; you'll see a small set of mountains with an opening. Enter when you're ready.
Snow Cavern
Snow Cavern has 13 chests and two boss fights. Enemies are mostly undead: Ghouls, Shadows, Zombies, Dead Heads, Dual Heads. All weak to Fire. Ghouls inflict Blindness; use Esuna. Grenades self-destruct when damaged, so kill them all at once or wait for them to whiff the explosion, then burst them down.
B1. Go up the long staircase. Icicles spawn here; two physical attacks drop them. At the top, go left along the upper section for chest 1 (300 Gil). Continue south. At the first intersection, go right for chest 2 (350 Gil). Continue south and take the stairs down. Skip the door at the bottom.
B2. Walk through the water. Ignore the door, take the stairs down.
B3. Go left and up, loop around for chest 3 (Antarctic Wind). Save this item for the Adamantoise boss. But first, head back to the stairs, then take the path to the top right corner and climb back up to B2.
B2 Upper. You're on the upper section of B2 now. Walk to the intersection, then south to the bottom right corner for chest 4 (Battle Axe). Back to the intersection, go west for chest 5 (Antidote). Continue west for chest 6 (Mythril Mace) — six Grenades guard this one. Kill them all at once or wait for their self-destruct to miss. Equip the Mace. Double back to B3, then south through water to the next staircase.
B4. Circle the outer edge. Top left has chest 7 (Potion); just right is chest 8 (Blizzard Tome). Teach it to Firion (or whoever needs the spell). Continue south for chest 9 (Potion); just right is chest 10 (Mythril Spear). Go north, skip the door, take the stairs.
B5. Take the path west to the top left corner for chest 11 (Mythril Shield). Skip the nearby door; go right and south. Bottom left corner has chest 12 (Ancient Sword). Give it to Guy. It inflicts Curse on the boss, tanking its Defense.
The bottom right corner has a door. Inside is a room full of Beavers. Talk to the one against the top wall. Guy can speak Beaver. Ask about Goddess's Bell. He tells you there's a secret passage in the wall to the right.

See the wall in the top right corner of the Beaver room? Walk straight through it.
B6. The path zigzags down. Follow it to the bottom row; far right is chest 13 (Silver Cuirass). That's all 13 chests. Heal up before proceeding. Physical attacks bounce off this thing like nothing I've seen before, so you need Blizzard or the Antarctic Wind.
Boss: Adamantoise
Talk to the Adamantoise guarding the Bell to start the fight.
After the boss, go up and grab the Goddess's Bell from the wall.

Escape
Go up the stairs and through the door. This spits you back out at that door from B1 we skipped earlier. Near the beginning of the dungeon.
Follow the corridor north, then right. Borghen waits at the top of a staircase.

After the fight, Borghen reveals he booby-trapped the cave. A boulder trap triggers. The party runs for the exit, but Josef stays behind to hold back the boulder.

Josef doesn't make it out.
Back outside, ride the Snowcraft west until you hit grass, then cut southeast to Poft.