Tools and boss checkpoints
The chapter’s tools are obtained along the route; do not build an earlier puzzle around a later reward.
Scorched Dunes → Ancient Tomb
Clear the cave rubble from inside to move the boulder off the oil gusher. In the tomb, defeat Great Flocci for the Bottled Ship.
Scorched Ruins → Red Sun Temple
Complete the ruins’ entrance puzzles, then use colored orbs, torch sequences and mirrors inside the temple. The later Flocci conversation grants the Shovel.
Ancient Bridge → Red Sun River
Defeat Temple Guardian with Calypso. The Special tab is locked in that battle. Afterward, work through the river’s levers and final light / symbol puzzle.
Mount Red Sun
Captain Trotter precedes The Ancients. Finish the chapter finale for Firebrand.
Optional fight after the clear
Finn McCool becomes available in The Dunes Spot south of Vermillion Village after Chapter 4. The reward is Aggressor. He is not one of the story gates before Firebrand.