All five treasure vaults and key stones
The five vaults form a chain: Umbada sells the first Blood Key Stone, and the vaults that hold no weapon give the key stone for the next colour. Opening all five unlocks Forgotten Rooms (9.2% of Steam players) and three rusted weapons that evolve at level 10.
Start: the Blood Key Stone
Read Treasure Hunter’s Note III in a pillared room of Obmuer Temple. Umbada then sells the Blood Key Stone for 24 Ancient Coins.
Vault order
| Vault and key | Where | Inside |
|---|---|---|
| 1. Blood, Tower of Knowledge; needs the Blood Key Stone | Basement of the Entrance Hall. After the Necronomicon clears the flesh, beat the Candle Crawlers; the door is in the corner by a glowing mushroom. | Rusted Greatsword |
| 2. Blood, Verdant Hollow; needs the Blood Key Stone | Cliffs reached from the gate to the Rotting Cavern or from the Petrified Garden. Climb beside the gate, Wind Dash through a row of cliff windows into a dark room, take the left doorway. | Velvet Key Stone |
| 3. Velvet, Isle of Neasied; needs the Velvet Key Stone | Beside the Neasied Wing Altar: through a small cave and a hole in the floor, a hidden door at the back, then an elevator down; past two pillars. | Rusted Great Morning Star |
| 4. Velvet, Rotting Cavern; needs the Velvet Key Stone | Past the Rotting Cavern Wing Altar toward the shrine. The door needs four Dark Triangular Slates found nearby; or dash across the broken bridge above the altar and enter the hole in the far wall. | Jade Key Stone |
| 5. Jade, Deimpo Mausoleum; needs the Jade Key Stone | Doorway right of the Mausoleum Wing Altar, down the large stairwell; the entrance is set into the staircase wall. | Rusted Leaf Blade |
You can open vaults 1 and 2 in either order, since both take a Blood stone.
Shop unlocks
Evolving a vault weapon at level 10 makes Umbada sell a plain copy for 10 Ancient Coins: the Scaled Greatsword, a Great Morning Star variant and the Gilded Leaf Blade. Opening the Jade vault also adds the Ring of Wind for 30 coins. The copies count as separate weapons for Extensive Armaments; see weapon upgrades.
Sources
- GrindnStrat, all treasure room locations and rewardsVault order, locations, key stones and rewards.
- Steam discussion, completion listsVault colours and the broken vault near Obmuer.
- Steam global achievementsForgotten Rooms, 9.2% of players.