A rift appears in the northwest part of Gerudo Desert, on the cliffs. Tri can make an entrance into it.

Find Tri's Friends, Part 1

Go north into the cave, and you have to fight a dark ReDead and some Flying Tiles. After you defeat the ReDead, check on the glowing object to rescue one of Tri's friends.

Find Tri's Friends, Part 2

Exit the cave, then use echoes to get up on the ledges, and use echoes to reach the island to the east. Use a Wind Cannon echoto blow away the piles of sand. Use echoes to reach the more distant northeast island, and use a Wind Cannon to get rid of the glowing sand. Check on the glowing object to rescue another of Tri's friends.

Find Tri's Friends, Part 3

Go back to the starting area, then go west this time. You will encounter some Moblins. Defeat them, and one will drop a glowing object. Check on the glowing object to rescue another of Tri's friends.

Find Tri's Friends, Part 4

Go east, then use echoes to reach the floating island with the glowing object on it. Check on the glowing object to rescue the last of Tri's friends.

There will be a cutscene. Tri's level gauge will increase. You receive 2 Might Crystals.