I sank beneath the green sheen and watched the stamina bar bleed slowly away; I knew a single mistake would leave me gasping. You can feel the timer in your hands when the water closes over the screen. At the bottom, a small chest waits like a locked diary.
Most explorers ignore the murky pool northeast of Firefly Forest — How to get the secret Kalien outfit in DragonSword: Awakening
I found this one by accident while testing map edges for Moyens I/O. You don’t need to have the whole region unlocked to reach the spot: head northeast of Firefly Forest and scan the shoreline for an odd circle of ripples.

Swim into that patch and follow the vertical column of darker water. The treasure chest sits on the seabed; press F when you reach it to add the Vestment of the Great Spirit — Kalien’s ceremonial robes — to your collection for free.
Many players treat stamina items as optional — Stamina strategy that gets you to the chest
I’ve lost runs testing this, so consider my experience yours. The trick isn’t cunning combat or a rare key: it’s managing the stamina meter while you descend.

Bring a familiar that can plunge deeper than the rest — the water will carry you down, but familiars with extended underwater stamina are the difference between success and a restart. You’ll also want to adjust your camera while descending so the angle keeps you moving straight down instead of hugging surfaces.
Where is the Kalien outfit located in DragonSword: Awakening?
Short answer: under water, northeast of Firefly Forest. The chest sits on the very bottom of a vertical pool; you don’t need to finish the wider region’s unlocks to grab it. Steam players and console users (PlayStation/Xbox/Nintendo) report the same coordinates on community hubs.
What items do I need to reach the underwater chest?
Bring two consumables: Egg Renew and Assorted Rice Bowls. Egg Renew restores 25% of your stamina instantly. Assorted Rice Bowls cut stamina consumption by 50% while active — that halves how fast your meter drops and stretches every second you swim.
Can I get the outfit early in the game?
Yes. You can reach it surprisingly early if you’ve found a familiar with extended underwater range and you carry those two food items. The outfit is free and adds to your wardrobe immediately when you press F at the chest.

How I run it: eat the Assorted Rice Bowls before you start to halve consumption, keep the Egg Renew for when the bar hits the danger zone, and let your familiar carry you down. The chest is obvious once you hit the bottom — press F and the Vestment of the Great Spirit joins your collection at no cost.
If you want to share the coordinate screenshots, Steam guides and Moyens I/O’s thread are good places to pin them; community posts make confirming the pool’s exact pixel easier than guessing from memory.
Will you risk that thin stamina bar for a free ceremonial robe or wait until you’re overprepared?