Cooperative combat guide
Undead Forever World Bosses
Boss health persists across attacks. Every player can help move the encounter, while phases, retaliation, clan contribution, final-hit bonuses, and reward rolls make timing matter.
Current boss roster
These values come from the current authored boss data and may change with live balancing.
| Boss | Minimum level | Max health | Access and return |
|---|---|---|---|
| Morgue Titan | 1 | 100,000 | Open encounter; returns after a 24-hour respawn window. |
| Subway Broodmother | 5 | 350,000 | Open encounter; returns after a 24-hour respawn window. |
| Megawarren Colossus | 15 | 1,200,000 | Open high-health encounter; returns after a 24-hour respawn window. |
| Crimson Butcher | 1 | 250,000 | Requires the current season pass; configured for a 20-minute respawn window. |
How a boss attack works
A boss action spends the costs shown on the encounter, deals persistent damage to the shared health pool, and can deal damage back to the player. Successful hits award immediate Flesh, experience, and clan contribution according to the boss and current phase.
When the health pool reaches zero, the finishing hit has its own bonus values and the defeat resolves reward rolls. The boss dossier preserves status, contributor information, and prior drops so the encounter remains social even between attacks.
Phases change the trade
Later health stages draw from authored phase variants rather than only making the bar shorter.
Pressure phases
Some phases increase the damage a boss deals back. Morgue Titan can break into Chain Snap; Subway Broodmother can reach Queen Hunger; the final stretch is not automatically the safest time to spend every remaining action.
Armor phases
Bone Plate, Meat Wall, Larval Guard, and similar variants can reduce player damage. Compare the displayed result rather than assuming the same build always produces the same hit.
Reward phases
Phase data can increase rewards while also raising risk or resistance. A lower damage number can still be a useful contribution when the payout or clan score moves.
Enraged finishes
Final phases can be explicitly enraged. Heal first, watch the retaliation shown on recent hits, and do not confuse “almost dead” with “free final blow.”
Boss strategy that scales
The same five decisions help at 100,000 health and 1.2 million health.
- Choose the right encounter. A boss with lower entry cost and retaliation can be better progression than the largest available health pool.
- Read the current phase. Check whether damage reduction, retaliation, rewards, or an enraged state changed since the previous hit.
- Heal before the sequence. Plan for several attacks and the boss's variance, not only one average result.
- Match the build. Colony mutations can improve boss damage, boss damage reduction, and clan boss points. Equipment and account stats still determine whether those percentage gains have a strong base.
- Coordinate without waiting for perfection. Persistent health means a small useful hit today can be better than saving every resource for a final blow that another player reaches first.
- Value contribution as well as loot. Immediate Flesh and experience, clan score, top-contributor visibility, final-hit bonuses, and reward rolls are different reasons to participate.
Boss hits feed the cooperative layer. Read the clans and hordes guide to understand weekly contribution and why Colony's clan-points effects matter.