ARC Raiders Stella Montis Keys lead to four rooms spread across one of the game’s most confusing indoor maps. The Archives lock is on an upper eastern storage level, Assembly Admin connects to Central Corridor, and Medical Storage is downstairs from Medical Research.
Each key is consumed at its matching door. Here are the entrances, floor directions and visual cues for each door, so you can find the rooms without searching every identical corridor.
ARC Raiders Stella Montis Keys: Archives Key: east-side upper storage
The Epic Archives Key opens the storage room on the east side of the Cultural Archives. From the Eastern Tunnel, enter the Archives area and head up to the upper level. Keep to the eastern side and follow the passage to the secured storage-room door. Approaching from the Eastern Tunnel gives you a clearer route than circling the central gallery looking for a lock. This is the most clearly charted of the four ARC Raiders Stella Montis Keys. Don’t spend time opening fuel-cell doors elsewhere in the facility: the Archives lock takes the Archives Key itself. Its Epic rarity makes the room attractive, but no specific blueprint or gun is guaranteed inside.
Assembly Admin: Central Corridor
The Uncommon Assembly Admin Key opens a door between the Assembly area and Central Corridor. From the Assembly Line, travel east towards the ramp descending into the tunnels, then take the southern doorway into Central Corridor. The locked door is on your right, identifiable by the green line on the floor and the small Assembly Admin label. The room also has another approach from the upper railing. ARC Raiders Stella Montis Keys are consumed on use, so opening one door to this office doesn’t automatically unlock the other entrance.
Medical Storage: below Medical Research
Take the Uncommon Medical Storage Key into the Medical Research zone. From Assembly, follow the corridor into Medical Research and use a stairwell to descend to the lower level. The locked storage entrance is near one of the zone’s lower access passages and has the usual red-lit key-door indicators. It’s not the same as the fuel-cell access doors scattered around the research labs. ARC Raiders Stella Montis Keys for Medical Storage work at the key-specific entrance; if the interaction asks for a Fuel Cell, you’re looking at a different mechanism.
ARC Raiders Stella Montis Keys: Security Checkpoint: secured checkpoint wing
The Rare Security Checkpoint Key opens the secured room behind the Security Checkpoint in the upper Lobby, close to Security Bridge. Start on the Lobby’s second floor and head through the checkpoint into the security reception area. Turn right into the room behind security, follow the corridor, then take the opening on the left to reach the locked security-storage door. The nearby entrance is labelled Security Restricted Access, which makes a much better landmark than looking for an unrelated red-lit door anywhere in Stella Montis. The storage area contains a box locker, with other loot depending on the raid.
A simple route through the facility
Stella Montis has multiple floors and passages that look similar. For Assembly Admin, start near the Assembly Line and watch for the green floor stripe before Central Corridor. For Medical Storage, descend inside Medical Research. For Archives, enter from Eastern Tunnel and head for the east upper storage door. The Security Checkpoint room is approached from the upper Lobby via the checkpoint and Security Restricted Access. ARC Raiders Stella Montis Keys each point to a specific wing, so deciding which one you’re opening before your raid is better than carrying four keys and searching every corridor.
Why the doors are worth opening
The locked-room loot rebalance from Embark’s Flashpoint update increased value in proportion to key rarity. Archives is Epic, Medical Storage and Assembly Admin are Uncommon, while Security Checkpoint is Rare. That doesn’t give you a fixed drop list for any room. ARC Raiders Stella Montis Keys unlock access to containers; their contents still change. Other players may follow you through a door once opened, and the indoor facility makes it easy for footsteps to come from another floor or stairwell.
ARC Raiders Stella Montis Keys: Where to find the keys
Most ARC Raiders Stella Montis Keys come from scavenging, not from a guaranteed dispenser next to each door. Lockers, bags and drawers can contain access items for different maps as well as Stella Montis. Check the exact label when you find one. If your loadout has a Safe Pocket, use it for a particularly valuable key so a defeat doesn’t cost both your weapon and the access item. You don’t need to collect all four to visit one of these rooms, and there’s no special all-keys achievement attached to opening them.
Escaping after the room
Mark an active exit before entering a high-value room, especially if your route crosses the Central Corridor. The Assembly Admin door is near the connecting passages between Loading Bay, Lobby and Assembly, where Raider traffic can be heavy. ARC Raiders Stella Montis Keys are one-use items, and a successful unlock doesn’t automatically move you toward an extraction. Leave enough time to search the containers and retreat through the correct level rather than wandering the facility with a full bag and no mapped way out.
Related Guides
Official source: Embark Flashpoint Patch 1.22.0. Key data: ARC Raiders Wiki.
