'The Gauntlet' is a highly linear and trap-filled level, often set in a military base or a fortified complex. This level emphasizes navigating deadly hazards and intense combat encounters.

- Fortified Entrance: You'll start at the entrance to a heavily fortified area. Expect immediate resistance from numerous Cultists and Fanatics.
- Traps and Hazards: The level is designed as a series of traps: crushing walls, flamethrowers, laser grids, and exploding barrels. You'll need to time your movements carefully and often activate switches to disable these hazards.
- Security Systems: You might encounter security cameras or automated turrets. Destroy them quickly or find a control room to disable them.
- Finding the Keys: You'll need to find keys (e.g., Skull Key, Spider Key, Dagger Key) to unlock various sections of the complex. These are often found in control rooms or heavily guarded offices.
- Intense Combat Arenas: The level features several 'arena' style encounters where you're locked in a room with waves of enemies, including Death Shrouds, Fanatics, and Cultist Priests. Use your most powerful weapons and environmental cover.
- Environmental Puzzles: You might need to activate a sequence of switches to open a blast door, or reroute power to a specific section of the base.
- Exit: The exit is typically a large blast door or a transport vehicle that activates once all objectives are met and the gauntlet is survived.
This level is a test of your combat prowess and ability to navigate deadly environments. The Life Leech's secondary fire (drain life) can be a lifesaver in intense combat arenas, and the Tesla Cannon is excellent for crowd control. Always be aware of your surroundings for traps.