Braced Door

In the Slime Grotto, you will encounter Wither blockades. Focus your light on Wither sacs to break them and clear the path.

Continue through the Slime Grotto, breaking Wither sacs and blockades as you progress. Pay attention to the environment and use your dash ability (A button) when necessary.

In The Coral Sanctum, you will need to deliver three specific critters to a large coral island. Collect these critters by interacting with their homes.

To access one of the critters, you will need to cure a Wither-infested coral house by destroying all the Wither sacs connected by vines.

To access another critter, you will need to light red/orange corals to attract crabs, then use your light to make them move.

After delivering the critters, you will find a fuse. Use Twig (X button) to collect it and then slot it into a power device behind the main island to clear a path.

In The Lock Keeper area, you will find a large machine with a power device. Slot the fuse you found into this device.

To find the next fuse, sail to the left of the area and use Twig to operate a water claw mechanism. Fill the claw with water, then use it to overturn a crab and free a floating critter.

Use your light to open a golden gate and enter a cave. Break a Wither sac to find the first fuse in this area.

In the same cave, break Wither sacs on the left side to free another floating critter.