Cavern of Ice & the Airship

With Marilith down, head back to your ship. Sail directly north into a bay and dock there. Walk southwest until you hit shallow water, then take the Canoe heading west. Take the first immediate right and continue north. Take a left and stay on that path. You'll reach a fork facing south; head west and follow it around. You'll eventually reach land and can walk to the Cavern of Ice.

Cavern of Ice

This dungeon has cracked ice floors that collapse when you step on them. Some falls are required to reach treasure and the Levistone itself. Spiky ice patches work like Mount Gulg's lava, costing 1 HP per step per party member.

Most enemies here are undead or ice-based. Fire spells and Dia wipe them fast. But watch out for Mindflayers. They can kill a party member in a single hit with no warning; kill them first every time, or run. Check the bestiary for full enemy weaknesses.

Cavern of Ice Directions

B1. Follow the path until you get to some stairs. Nothing else here.

B2. Walk to the southwest corner and take the stairs down to B3. Nothing worth stopping for. The B3 steps take you back up to a different part of B2. Follow the path around until you reach a room with the Levistone and a chest on each side. Avoid the cracks in the floor and open the chests (access the right chest from the right side and the left chest from behind it). The right chest contains Clothes (monsters inside) and the left is a Flame Sword. You'll have no choice but to step on one of the cracks; it'll drop you to the next floor.

B3. A monster is waiting right in front of you. Take it out, then head west across the spiky ice and enter the room with two chests. Right chest has Ice Armor (monsters inside), left chest has Mythril Gloves. Exit the room and walk to the very south of the floor where there's a room with 6 Gil chests, 2 of them containing monsters. Over 41,000 Gil total. Leave the room and take an immediate right to some stairs that bring you back up to a different part of B1.

B1. There's an Ether in a chest immediately south of the stairs. Walk south and you'll see another room with 10,000 Gil. Exit the room, walk north and take a right then go south (don't be like me in the video taking the long way around). You'll enter a room with 3 chests and a crack on the floor. The Ice Shield is in here. Open the chests and then fall through the crack. You'll land back in B2.

B2. Avoid the cracks and approach the Levistone.

Evil Eye

The Evil Eye has only 162 HP but packs Death, Glare, and Rub. Any of those can kill a party member instantly, so speed matters. Haste your Warrior or Monk, have your Black Mage cast Thundaga or Firaga, and go all-in. Don't waste turns on buffs; the fight should end in 1-2 turns.

Pick up the Levistone. To exit, fall through one of the cracks. You'll land back on B3 and have to fight the undead again. Follow the B3 and B1 path from earlier (minus the chests). This time, don't go into the room with the 3 chests and crack; instead follow the path outside that room to some steps that lead you out of the dungeon.

Raising the Airship

Head back to Crescent Lake, rest at the inn, and restock. Take the canoe west but this time head south immediately and follow the river until you reach land. Step off and enter the small desert south of town. Walk into the sand and the Levistone will raise the Airship from beneath the dunes.