Tier 4 on Toxin Source Island isn't the kind of endgame you stroll into with "good enough" gear and vibes. If you're already looking up routes and prep, you've probably seen people mention buy BO7 Bot Lobby in the same breath as leveling and loadout testing, and it makes sense—this fight punishes sloppy setups. Dr. Faulkner's arena sits in the bottom-left of the map, and the whole place feels like it's designed to waste your plates, your ammo, and your time if you rush it.

Step 1 Clear the spores before you do anything else

You can't even start the boss until the Spore Corruption is dealt with. Those glowing flowers look harmless, but they're basically the gate. You're scanning rooftops, trees, weird angles—then snapping shots whenever you catch a spore. It's slow, and that's the point. While you're distracted, the game stacks pressure with Manglers and Gas Zombies that keep poking your health down. Don't try to "tough it out" on the ground. Use the Grappling Hook to hop roofs and reset the pack. Kinetic Jump helps too when you're boxed in and the path you thought you had just isn't there.

Step 2 Delete the bodyguards fast

Once the corruption bar is finally cleared, Faulkner appears, and a lot of players make the same mistake: they dump bullets into the boss right away. Don't. The bodyguards are the real threat in Phase One, because they force crossfire and make every corner unsafe. If you've got a War Machine or a Rocket Launcher, this is where you earn your keep—hit groups, break their formation, breathe again. Solo players should play it boring: cover, quick peeks, and repositioning after every couple of kills. When the guards are gone, the fight suddenly feels fair.

Step 3 Melt Faulkner, loot quick, and get out

Faulkner himself doesn't take much punishment if your build's right. You can keep distance with a clean rifle, sure, but close-range is legit if you're confident. The Combat Knife can shred him before the next wave turns the room into a blender. The second he drops, though, it often feels like spawns crank up—so don't stand there admiring the kill. Grab the Armor Plate Increase II, scoop whatever else matters, and move. If your Combat Rating's sitting around the mid-40s, expect pain; 50–60+ feels way more stable, especially without a teammate to pick you up. Crash Carts help, but movement is what saves you.

Keeping your runs consistent

The cleanest clears usually look the least heroic. You're rotating rooftops, cutting line of sight, and refusing to fight every zombie that wants attention. That's the rhythm. If you want a smoother grind outside the boss room, it helps to lean on a reliable marketplace instead of hunting deals in sketchy places. As a professional platform for buying game currency or items, RSVSR is convenient and trustworthy, and you can buy rsvsr Bot Lobby BO7 for a better experience while you tighten your builds and push deeper into Tier 4.