You’re wandering around the Depths, everything is pitch black, and suddenly you’re tasked with building a literal soul-swapping robot. It’s wild. If you’ve reached the "Constructing a Guide" quest in The Legend of Zelda: Tears of the Kingdom, you know the drill. You need four limbs. The Left Arm Depot is one of the trickiest spots to navigate because of how the physics puzzles play out once you actually step inside. Honestly, the first time I rolled up to the Great Abandoned Central Mine and realized Mineru needed a whole new body, I figured it would be a quick fetch quest. I was wrong. It’s a journey.
The Left Arm Depot isn't just a room with a chest. It's a localized puzzle box. You’ll find it southwest of the Spirit Temple, tucked away in the shadows of the Faron region's underground equivalent. Getting there is half the battle, but once you’re in, the game expects you to understand how lava and Ultrahand interact in ways that aren't always intuitive.
Locating the Left Arm Depot Without Getting Lost
Finding this place is annoying if you haven't mapped out the Uonitayam Lightroot. It’s dark. Like, really dark. The Left Arm Depot is located at the coordinates 0708, -3023, -0487. If you’re looking at your map, head southwest from the Muokuij Lightroot. You’re looking for a large, ominous stone structure built into the side of a cliff.
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Once you touch the green Zonai pedestal at the entrance, a gate slams shut behind you. Now you’re stuck with a giant stone box containing the left arm. You can’t just carry it out. You have to work for it. Most players make the mistake of trying to backtrack immediately. Don't. The exit is forward, through the lava.
Cracking the Lava Puzzle
Inside the depot, the floor is basically a lake of fire. You’ll see some Big Wheels and some stone slabs lying around. This is where Link's Ultrahand becomes your best friend. The goal is to get that box across the lava without it—or you—burning to a crisp.
Here is the thing: the lava is shallow enough for vehicles. You want to attach the wheels to the side of the box, but positioning is everything. If you put them too high, they won't touch the ground. Too low, and the box drags. I’ve seen people try to build elaborate bridges out of nearby debris, but the "intended" way is much simpler. Attach the wheels directly to the box's sides, stick a Steering Stick on top if you have one in your inventory (though the game provides some basic parts), and drive it across.
The Grates and the Door
After the first lava stretch, you’ll hit a door. There’s a wheel nearby. Spin it. This isn't a complex mechanism, but if you're rushing, you might miss the timing. The door stays open for a bit, but you need to move the box through quickly.
Then comes the real head-scratcher. There’s a second lava pool with a narrow ledge and some overhead grates. This is where most people get stuck. You can’t drive through this one as easily because the path is blocked by a mesh-like ceiling. You have to get creative with how you orient the box.
Basically, you need to turn the box sideways so it fits through the gap between the lava and the ceiling. Use the wheels to propel it along the narrow stone "rails" on the side. If it falls in the deep lava, it resets. It’s frustrating. It really is. But once you clear that second pool, you’re basically home free.
Why Mineru’s Questline Changes Everything
Completing the Left Arm Depot in Tears of the Kingdom is a huge milestone because Mineru’s Construct is a game-changer for exploration. While many players focus on the four main Regional Phenomena (the Rito, Goron, Zora, and Gerudo), this "Fifth Sage" quest is where the late-game power spike happens.
Having the Left Arm attached allows you to fuse items to the Construct’s hands. Think about that. You can put a Frost Gleeok Horn on one hand and a Cannon on the other. It turns the game from a traditional Zelda adventure into something resembling a mecha-battler. But you can't get that utility until you've dragged that heavy stone box out of the depot and back to the core.
Common Mistakes at the Left Arm Depot
People overthink the physics. I've done it. You think you need a 10-part flying machine to get across a 20-foot gap.
- Ignoring the Big Wheels: The wheels provided in the room have high clearance. They are designed to roll through lava. Use them.
- Forgetting Recall: If your box starts drifting away into a pit you can't reach, hit the Recall button immediately. It saves so much time.
- The Exit Route: Once you get the arm out of the final room, you’ll find yourself at a high ledge. There’s a fan and some wings nearby. Don't try to walk it back. Build a quick plane, attach the arm to the center for balance, and fly back to the Spirit Temple.
The atmosphere in these depots is heavy. It feels ancient. The sound design—that low, mechanical hum of Zonai technology—really sells the idea that you’re uncovering a lost industrial age of Hyrule. It’s a stark contrast to the bright, breezy skies of Great Sky Island.
Final Steps for the Left Arm
Once you arrive back at the central hub, place the box near the mold. It’ll break open, revealing the actual arm. Ultrahand it into place. You’ll see the green glow signify it's locked in.
If this was your last piece, congratulations, you’re about to fight a boss. If not, you’ve likely still got the Right Arm, Left Leg, or Right Leg to go. Each depot has a unique theme—the Right Leg involves a lot of verticality and elevators, while the Left Arm is strictly about heat and horizontal movement.
To make the rest of your Depths exploration easier, make sure you've stocked up on Brightbloom Seeds. The path between the Left Arm Depot and the Spirit Temple is littered with obstacles and enemies that love to hide in the dark.
Next Steps for Your Journey
After finishing the Left Arm Depot, head immediately to the Right Leg Depot if you haven't already. It's located to the north of the Spirit Temple. You'll need to use fans and "U" shaped blocks to navigate a series of elevators. Once all four limbs are attached, prepare for a battle in the Spirit Temple that requires you to master the Construct’s blocking and punching mechanics. Make sure you have a few Spare Batteries in your inventory, as the Construct drains energy quickly when you're using fused attachments like Flamethrowers or Cannons. Reach the boss, reclaim the Secret Stone, and you'll finally have the Vow of Mineru to assist you in the final push against Ganondorf.