Hey fellow travelers! 😊 As a hardcore Genshin Impact player since launch, I've spent countless hours exploring every nook and cranny of Teyvat, and let me tell you, The Chasm's Underground Mines are still one of the most thrilling areas even in 2025. Seriously, with all the updates over the years, this hidden quest for the Orbs of Blue Depths remains a gem—it's not handed to you on a silver platter! No quest alerts here, folks. You gotta hunt down these nine mysterious orbs by defeating Shadowy Husks (yep, those sneaky Black Serpents) to unlock a secret room in the Nameless Ruins. And trust me, the payoff is sweet: you'll snag the 'Crede Tenebrae' achievement from Wonders of the World. It's like uncovering buried treasure without a map! 🗺️✨ But don't worry, I've got your back with this detailed walkthrough based on my own adventures. Let's dive in and make this a breeze!

First off, a quick pro tip: use your Adventurer Handbook to track down the nearest Shadowy Husks—it's a lifesaver for finding six of them easily. Oh, and these baddies respawn, so you can farm their drops for ascension materials later. Perfect for prepping new characters in the latest patches! Now, onto the juicy part: all nine orb locations. I'll break it down step by step with images, strategies, and a handy table for reference. Remember, each orb drops only after your first defeat, so no repeats needed. Here's the full scoop:

🗺️ All 9 Orb of Blue Depths Locations

To make this super clear, I've compiled a table summarizing each spot. Use this as your cheat sheet while exploring:

Orb #	Shadowy Husk Name	Location in The Chasm	Element & Weapon	Key Strategy
1	Skeld	Ad-Hoc Main Tunnel (caged room)	Cryo, Shield	Retrieve Miner's Key first!
2	Haltaf	Serpent's Cave (bottom, near Dark Mud)	Pyro, Polearm	Bring Hydro characters to break shield
3	Hyglacg	Underground Waterway (south of waypoint)	Hydro, Spear	No shield—dodge his watery thrusts
4	Herger	Glowing Narrows (near Geo mushrooms)	Hydro, Spear	Avoidable attacks; easy win
5	Serkir	Nameless Ruins (southwest glide)	Cryo, Shield	Use Lumenstone Gadget for Dark Mud
6	Roneth	Glowing Narrows (deep cavern bottom)	Cryo, Ranged	Watch out for freezing in water
7	Edgetho	Underground Waterway (middle section)	Anemo, Claymore	Defeat Pyro companion first
8	Buliwyf	Stony Halls (Seelie court, behind wall)	Anemo, Pyro Shield	Swirl reaction works wonders
9	Rethel	West of Glowing Narrows (cavern drop)	Anemo, Windcutter	Glide down carefully

Now, let's get into the nitty-gritty details for each one. I'll share exact routes and battle tips from my own runs—this isn't just theory; I've been there, done that! 💪

1. Skeld in Ad-Hoc Main Tunnel

Starting strong! Head to the Ad-Hoc Main Tunnel and find that caged room at the base level. But hold up—you need the Miner's Key first. Dig it up from an Investigation point in the Serpent's Cave north tunnel. Once inside, Skeld awaits with his Cryo shield and ranged attacks. Brrr, chilly! 😅 My advice? Use Pyro characters like Hu Tao or the latest 2025 pyro DPS to melt through his defenses. Here's a visual to help you spot the spot:

2. Haltaf in Serpent's Cave

Teleport to the waypoint here and glide straight down to the very bottom. Haltaf's chilling (pun intended) in Dark Mud, swinging his Pyro polearm. Ugh, that mud slows you down! Bring Hydro characters—I used Yelan or the new hydro healer from Sumeru—to break his shield fast. Clear the mud first if it's bugging you. Easy peasy once you're prepped.

3. Hyglacg Near Underground Waterway

Take the waypoint south and follow the river until you hit an old structure's hole. Hyglacg's on the second floor, no shield, just Hydro-infused spear attacks. He's slippery but manageable—dodge sideways and counter with Electro for reactions. Simple win!

4. Herger in Glowing Narrows

From the waypoint, bend around and you'll find Herger near those exploding Geo mushrooms. He's like Hyglacg's twin with Hydro thrusts—so predictable! Just sidestep and unleash your DPS. No biggie.

5. Serkir in Nameless Ruins

Glide southwest from the ruins waypoint. Serkir's by an Oozing Secretion with Dark Mud everywhere. Use your Lumenstone Gadget (still essential in 2025!) to clear it. He's Cryo-shielded, so bring Pyro or Geo to shatter it fast. Range attacks? Pfft, dodge 'em!

6. Roneth in Glowing Narrows Cavern

Teleport southeast and glide down that deep hole—Roneth's waiting at the bottom with Cryo attacks. The water here can freeze you, so equip anti-freeze artifacts or use quick-swap teams. Annoying but doable!

7. Edgetho in Underground Waterway

Start from the southern waypoint, enter left, and follow the ledge. Edgetho's on a platform with a Pyro buddy—take out the companion first! His Anemo claymore whips around; dodge and use crowd control. Fun fact: this spot ties into older quests, still relevant today.

8. Buliwyf Near Stony Halls

Teleport south, follow the left ledge to the Seelie court, and bust through a destructible wall. Inside, Buliwyf has a Pyro shield and Anemo claymore—plus two pals! Swirl reactions are key here; I used Kazuha for clean sweeps. The wall respawns, so farm it later if needed.

9. Rethel West of Glowing Narrows

Last one! From the waypoint, tunnel west and glide down the cavern drop. Rethel's another Anemo windcutter—dodge his swipes and counter hard. Feels great to wrap up the set! 🎉

Once you've got all nine orbs, the real fun begins! Head to the Nameless Ruins waypoint, climb the southern wall, and glide down to the locked mechanism. Unlock it to access the hidden room—boom, achievement unlocked! 🏆 Plus, you'll find cool loot inside, sparking even more mysteries. Honestly, in 2025, this quest is still a blast, and it sets up future storylines. Go enjoy it, travelers—and share your own tips in the comments! 💬