Hey Travelers! It’s 2026 and I’m still deep-diving into Teyvat’s hidden corners ✨. Lately I’ve been helping a friend retrace the steps through The Chasm – and wow, this area from way back in Version 2.6 still holds so many secrets! One of my favorites is the mysterious Orb of the Blue Depths quest. You stumble upon these glowing orbs dropped by shadowy Black Serpent Knights, and if you gather all nine, a hidden treasure room opens in the Nameless Ruins. So if you’re revisiting the mines or you somehow missed this, here’s a cozy, map-packed guide with every location, all the sneaky fights, and the Miner’s Key you’ll need. Grab your adventurer’s tea ☕️ and let’s go treasure hunting together!

🌟 What Are the Orb of the Blue Depths?

These are 9 special quest items you get from defeating Black Serpent Knights (or Shadowy Husks) scattered around the Underground Mines of The Chasm. Each orb pulses with a eerie sapphire glow, and once you’ve collected them all, they unlock a device in the inverted city of the Nameless Ruins – leading to a luxurious secret room and the achievement “Crede Tenebrae.” Not only do you bag some precious chests, but the whole experience feels like a mini archaeological dig!

🗺️ Where to Find All 9 Orbs

I’ll walk you through each orb location with the same path I used. Make sure you’ve unlocked all the Underground Mines teleporters first, and pack a strong team – those knights hit hard. 💪

Orb 1 – The Serpent’s Cave Crevice

Right by the teleporter of The Serpent’s Cave, look down into the deep chasm nearby. Glide into the crevice and you’ll spot a lone knight guarding the first orb. A quick drop-attack and it’s yours!

Orb 2 – Behind the Locked Door (Miner‘s Key needed)

Fast travel to the entrance of the Underground Mines. There’s a locked door just ahead. To open it, you need the Miner’s Key. Once inside, the knight waits patiently – defeat him for the orb.

🗝️ Miner’s Key Location

From The Serpent’s Cave teleporter, head north through the tunnel until you find a small dead-end chamber with a shining investigation spot. The key is right there! See the snapshot below to match the cliff wall.

Orb 3 – Underground Waterway Open Space

Teleport to the Main Mining Area. Run into the western tunnel and hug the cliff – don’t jump down! Follow the path until you reach a wide, open cavern in the Underground Waterway. Two Black Serpent Knights await; you’ll get the orb after the battle.

Orb 4 – North of the Nameless Ruins

From the Nameless Ruins teleporter, head north toward the church-like building where you rang one of the two bells during the Archon Quest. The knight is patrolling right outside that structure – take him out and claim the orb.

Orb 5 – Nameless Ruins Ground Level

This one is super sneaky! It’s not inside the floating inverted city. Stay at ground level near the Nameless Ruins teleporter and check the immediate area. The dark husk is only a few seconds away, often hidden behind some ruins.

Orb 6 – South Nameless Ruins, Behind a Breakable Wall

Go south from the ruins until you reach the spot where you found the second bell. Before the broken bridge, you’ll see a suspicious rocky wall. Smash it (claymore or Geo works best) and you’ll face three Black Serpent Knights. It’s a tough fight, so bring your healer! The orb drops after the last one falls.

Orb 7 – Crevice Beyond the Second Exploration Camp

From the camp of Zhiqiong and the exploration team, descend into the deep crevice that leads to The Glowing Narrows. At the bottom, a knight will ambush you – stay alert! ⚔️

Orb 8 – Breakable Wall in the Glowing Narrows

Immediately after teleporting to The Glowing Narrows, look for another breakable wall near the waypoint. Behind it, a lone knight guards the orb. Smash, defeat, collect.

Orb 9 – Tunnel to the Giant Blue Nail

The final orb is at the end of the winding tunnel that connects The Glowing Narrows to the area with the gigantic, glowing blue nail. Once you exit the tunnel into that majestic space, the last Shadowy Husk will be waiting.

💡 Pro Tip – Use the official Teyvat Interactive Map to mark off each Shadowy Husk if you’re a completionist like me. It helps a ton to track those sneaky knights!

🔮 How to Use the Orb of the Blue Depths

Now for the fun part! Head back to the Nameless Ruins and take the wind current up to the inverted city (you unlock this area during the Archon Quest with Dainsleif). Once inside the upside-down city, go to the main central room with the inverted water fountain. Exit from the southern doorway and keep walking straight – you’ll spot a strange stone device with a blue slot.

Interact with it, insert all nine orbs, and watch the magic happen! A hidden door slides open, revealing a secret chamber stuffed with treasure chests, Mora, and an exquisite sense of accomplishment. Plus, you’ll earn the achievement “Crede Tenebrae” – perfect for showing off your dedication. 🌠

Even though this quest is from way back, it’s still one of the coolest environmental puzzles in Genshin. The atmosphere of the inverted ruins, the haunting soundtrack, and the thrill of chasing those knights make it a must-do for any explorer. So whether you’re a veteran returning for nostalgia or a newbie cleaning up old quests, I hope my mini guide helps you uncover every last glittering orb. Happy hunting, and may your 50/50s always go your way! 💖