In-isa Shrine (The Ability to Combine)

In-isa Shrine teaches Fuse: fuse a boulder to a Rusty Claymore to make a Boulder Hammer, fuse Fire Fruit to arrows, and burn the vines to drop the Small Key chest. Only the Small Key is needed to progress; the Arrow x5 chest is optional.

Region	Great Sky Island (Central Hyrule Sky)
Location	On a hill across the large lake in the southwest of the island; cross the water on a log-and-sail raft
Trial	The Ability to Combine
Type	Tutorial ability shrine (Fuse)
Ability gained	Fuse
Chests	Arrow x5 · Small Key
Reward	Light of Blessing

How to find In-isa Shrine

The shrine is the second stop of The Closed Door. From Ukouh Shrine, head south along the west side of the island to the large lake. At the shore, use Ultrahand to line up logs, attach a sail board upright on them and push off; the wind carries the raft across. Land on the far bank, climb the rocks and follow the stone path up to the shrine stone, then step onto the blue platform.

Logs lined up at the lake shore with a sail board being attached upright to make a raft

Log raft with an upright sail crossing the large lake

In-isa Shrine solution

Make a Boulder Hammer

Rauru gives you Fuse in the entrance hall. Pick up the Rusty Claymore on the floor below, equip it, aim Fuse at a boulder and confirm; the preview shows the Boulder Hammer. Use it to smash the cracked wall blocking the room.

Item box reading Rusty Claymore, the sword lying on the floor of the entrance room

Boulder highlighted green with the Fuse prompt beside a Rusty Claymore

Break the corner pillar

In the flooded room beyond, one of the pillars holds a chest. Smash the corner pillar with the hammer to reach the Arrow x5 chest (see chests below).

Cracked stone pillar in the corner of the flooded room, within reach of the hammer

Corner pillar shattering to uncover the chest

Gather Fire Fruit and the bow

In the side chamber, pick Fire Fruit from the small trees and take the Old Wooden Bow and arrows lying nearby. Draw the bow, hold the material button and select Fire Fruit to attach it to the arrow.

Fire Fruit item box in the side chamber with small fruit trees

Old Wooden Bow lying beside Fire Fruit trees with a pickup prompt

Burn the vines

A chest sits on a platform high on the wall, hidden behind dry vines. Fire a Fire Fruit arrow into them and the chest falls to the raised platform below.

Fire Fruit arrow striking the dry vines that hold the chest

Dry vines burning on the wall where the chest hangs

Unlock the door

Climb up and open the fallen chest for the Small Key, then use it on the green locked door on the main path.

Raised platform under the burned vines where the chest has dropped

Green locked door with a round lock at the top of the stairs

Defeat the Captain Construct I

The hall beyond is covered in dry leaves with a Captain Construct I at the far end. Shoot a Fire Fruit arrow into the leaves to set them on fire and weaken it, then finish it with the Boulder Hammer. It drops a Captain Construct I Horn, which you can fuse to a weapon.

Hall floor covered in dry leaves with the Captain Construct I at the far end

Line of fire spreading across the dry leaves toward the Construct

Smash the last wall

Break the cracked wall at the end of the hall with the hammer and climb the steps to the altar.

Cracked wall at the end of the hall bursting under a hammer hit

Altar seal glowing green at the top of the steps with an Examine prompt

In-isa Shrine chests

Arrow x5: smash the corner pillar in the flooded room after the first wall to uncover the chest and collect five arrows. It is the extra chest that is easy to walk past.

Flooded room with cracked stone pillars standing in shallow water

Item box reading Arrow x5 after opening the chest from the corner pillar

Small Key: the chest that drops when the vines burn lands on the platform under the wall. You need its key to open the locked door.

Raised platform under the burned vines with the fallen chest

Item box reading Small Key, a key to a door inside a Shrine of Light

Light of Blessing

Climb to the altar and examine the green seal to collect a Light of Blessing. In-isa is a Sky shrine, so there is no Lightroot below it.

Light of Blessing item box in front of the shrine altar

Nearby

The other shrines on the island are Ukouh Shrine (Ultrahand), Gutanbac Shrine (Ascend) and Nachoyah Shrine (Recall). Gutanbac is the next one on The Closed Door.

Tips

Keep the Boulder Hammer equipped all the way through; every cracked wall and pillar breaks in a few swings.
Pick more Fire Fruit than you need: one arrow burns the vines and another handles the leaves in the Construct room.
Any weapon works for the boulder; you are not limited to the Rusty Claymore.
You can also keep your distance and shoot the Construct with arrows rather than fighting it in melee.