These are required to enter the lab for end-game boss fights. They typically begin dropping in Heroic difficulty [18].
The Factory on Hard mode is widely considered the best spot for military crates and weapon safes [31]. 💾 Technical Tips
You can right-click weapons in your inventory to change skins or use Mutation tickets to alter their colors [12]. ⚔️ Boss Strategies
Bosses drop critical items like keycards and documents needed for progression [20].
Sound is often more important than sight. Always use headphones ( Comtacs ) and walk more than you run to hear enemies before they see you [17].
Black keycards (dropped by bosses or rarely sold by the black marketer) unlock barracks with high-tier weapons and attachments [8].
Found in the Hell difficulty Hospital, he uses an LMG. Defeating him is the best way to acquire your own machine gun [18].