You're looking for purple coils embedded in the Bio Lab walls:
Located in Lower Level, First Door
Located in Lower Level, Opposite End
Located in Second Floor, Above Melee Machiatto
Critical Success Tips:
Deploy Smoke Grenades for vital cover
Use Idle Eyes Gobblegum for emergency breathing room
Aether shroud will also come in clutch!
Have teammates form defensive perimeter (co-op)
Save equipment specifically for this sequence
Ultimate Boss Battle: Patient 13
After completing all previous steps, you've finally reached the pinnacle of the Terminus easter egg — the epic showdown with Patient 13. This isn't your average zombie boss fight; it's a multi-phase battle that will test everything you've learned so far. Before initiating the fight, ensure your entire team is fully stocked: Pack-a-Punched weapons, armor plates, perks, and most importantly, Scorestreaks!
The fight begins with Patient 13's first form, where glowing weak points appear on both shoulders. This initial phase is straightforward but don't let your guard down. Utilize the arena's boxes for cover while coordinating your attacks. In co-op, having one player draw attention while others focus fire on the weak points is a solid strategy. Remember, Patient 13 hits hard - those boxes aren't just for decoration.
As soon as you destroy the shoulder weak points, the battle intensifies. The arena fills with poison gas while waves of zombies pour in. You'll need to multitask here: clear zombies, shoot external tentacles to reduce poison levels, and prepare for Patient 13's return. When it emerges again, its weak points have shifted to its tentacles, eventually moving to its mouth. Each successful damage phase triggers new waves of enemies, including tough Amalgams and Manglers that can quickly overwhelm an unprepared team.
Final Phase
The true test of skill comes in the final phase, where the arena dramatically shrinks and Patient 13 unleashes its full arsenal. You're left with just two boxes for cover, making positioning crucial. Watch for Patient 13's blue glow - this is your cue to either dive into the water or duck behind cover to avoid its devastating attack. Between these moments, focus fire on its alternating weak points: the piercing blue eyes and gaping mouth. This is the time to use every Scorestreak and tool at your disposal.
Critical Success Tips:
The weak spots glow! You can’t miss them!
Coordinate Scorestreak usage with your team
Always keep one player designated for crowd control
Learn to recognize Patient 13's audio cues - they'll save your life
Don't get greedy with damage - survival is priority one
Victory & Rewards