Fans of the original might recall how they needed different clearance-level keycards to access different sections of the Oldest House, and it's the same case with Control Resonant. Clearance Level 6 is one of the keycards you require to open up various offices within the Oldest House, but if you're strictly following the main story missions, you might end up missing out on it. Here's how players can get their hands on the Clearance Level 6 keycard in Control Resonant.
To get the Clearance Level 6 keycard in Control Resonant, you'll need to progress the story until Act 3. At the start of Act 3, you'll receive a side quest called "Zoe's Briefing," which will basically unlock a side story called "New Growth." This is an investigation quest that will basically set Dylan on the trail of a missing researcher called Dr. Underhill and her questionable methods to deal with the mold.
Thankfully, you won't need to complete the New Growth side story completely to get the Level 6 keycard. All you need to do is complete the first objective, which will send Dylan to the FBC Base in The Park zone. Dylan will pick up the Clearance Level 6 keycard from the table, alongside some info on Dr. Underhill.
The Clearance Level 6 keycard in Control Resonant is mainly used to unlock two different offices in the Central Executive sector of The Oldest House. Both of the offices are located on the upper floor, one of them being Dr. Underhill's office, which you'll need to access via the keycard to progress the quest.
The other office will contain some more lore files and a container that will give players some rare resources to use for crafting and upgrading.
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