There are multiple items that you will need to find as you explore the different regions in Once Human. Each region contains several unique resources that you cannot find anywhere else, and the same goes for the keycards that some of the stronger enemies drop, such as the Rosetta V2 Access Cards.
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The Access Cards allow you to open locked doors hidden in the more fortified strongholds in Once Human. The Rosetta V2 Access Cards are from a specific region and only open certain doors. They will not work in other Rosetta strongholds, meaning you will definitely want to know where to find them and what doors they can open.
The Rosetta V2 Access Cards have a chance to drop enemies into a specific stronghold in Once Human. The trick to finding the one you need for a specific door depends on the region you’re exploring. For example, one of the starting regions you can explore at the beginning of your journey, Broken Delta, unlocks security doors in that region. They don’t work in the next area, Iron River, but you can find other Rosetta V2 Access Cards.
You'll need to check your inventory to see which security doors the Rosetta V2 Access Card opens. If you have any for Iron River, they won't work in Broken Delta. I've noticed that these cards have a high chance of dropping from Rosetta NPCs in Once Human. If you're hunting for these items, focus most of your time on these NPCs or on strongholds that have a high concentration of them. While you're running through a stronghold to unlock all the weapons and gear crates, one or two guards protecting that location may drop one of these access cards.
