Bosses

Your first wall — a colossal Brute that periodically calls in packs of Runners (3 at a time) to harass you while it lumbers in. It's slow, so the fight is about not getting pinned between the King and its summons. Kite wide, gun down each Runner pack as it arrives, and chip the King on the way past. Faced right after the fists-only warm-up, so it's tuned as a gentle introduction to boss fights.

A ranged zoner that fires fast 3-shot acid bursts from long range and seeds the arena with extra Spitters. The danger is crossfire — the Queen and her brood pepper you from multiple angles at once. Use the Vat Halls' pillars as cover, break line-of-sight, and dash through the bursts to close and burn her down. Kill the summoned Spitters so the angles don't stack up.

A change of pace: the Warlord is a fast melee charger (speed 80, the quickest boss) that hits like a truck and spawns Bombers to corner you. You can't simply outrun it the way you do the slower bosses — you have to use the dash to break its approach and keep obstacles between you. Detonate the Bombers at range so you're never caught between an explosion and a charge.

The original Campaign capstone — a relentless summoner that raises five Zombies at a time on a fast timer while throwing 4-shot projectile bursts. Left unchecked, the arena drowns in undead. This is a DPS-and-discipline check: you need enough firepower (and ideally an area weapon) to clear the adds faster than they're raised, while never letting the projectile bursts and the horde pin you in a corner.

You reach the rooftop, the evac bird is inbound, and the Overseer drops in — a shielded ranged zoner that takes 25% less damage, hammers 5-shot projectile volleys, and summons Brood (which split into Spawnlings). It looks like the end of the game. It isn't. Beating the Overseer is what triggers the secret finale — so come into this fight with ammo and health to spare.

The original infected — patient zero of the whole outbreak.

A fast, armed brute-fiend: it moves quickly (speed 74), fires 5-shot bursts, and summons Archdevils ×2 — each a mini-boss in its own right. The combination of a mobile hard-hitter and elite ranged adds is brutal. Save your heaviest single-target weapon (Railgun) and your panic tools (Rocket, Barrels) for this. Kill the Archdevils first or their bursts will overwhelm you.

The source. The thing every other monster came from.

The colossal final wall — the biggest body in the game, 3400 base HP, an 18% damage shield, devastating 6-shot projectile volleys, and a steady stream of summoned Brood ×3. There's no trick that skips it; it's an endurance test of everything you've learned: kite the splitting adds, dash through the volleys, and grind the Progenitor down between clears. Drop it and you've cleared the Campaign.

A horned ranged overlord that doesn't appear in the Campaign chain but turns up as a boss in Endless mode's generated arenas. Fast for a boss, fires 5-shot fireball bursts from long range, and summons Archdevils. Same playbook as the other ranged bosses: break line-of-sight, clear the elite adds, and close the distance in dashes.