What is it?
An alliance PvE challenge: push the highest level your alliance can clear with rallies for escalating rewards. Confirmed Mechanic
When does it happen?
Every other week, alternating with Zombie Invasion — 3 days to clear. Update-Sensitive
Who can start it?
Alliance rallies. Alliance Leadership organizes; every member contributes.
How does it work?
You climb levels for escalating rewards. Level 4+ unlocks Overlord shards; Level 5+ adds 35 drone parts. Top alliance challenge tiers award up to 26.5M resources + 90M hero EXP per participating member. Waves 1–15 are manageable; waves 25–30 scale sharply. Confirmed Mechanic
What should I prepare?
Rally troops ready, an agreed target level, and the right squad types and resistance for the higher waves.
How do we win?
Push the highest level the alliance can handle, together, and start rallying at wave 20+ to cut troop loss — don’t solo the hard waves. Get to Level 4 minimum for the Overlord shards, Level 5 for the drone parts. Corroborated Strategy
Common mistakes
- Members settling at a low stage because they “can’t beat it” — push together.
- Soloing waves 20+ and bleeding troops.
- Stopping short of Level 4 and missing the Overlord shards.
Leadership protocol
Set the target level, organize rally chains from wave 20 up, and push members past their comfort stage — alliance progression raises everyone’s rewards. Leadership Protocol
Two cliffs define this event: rewards jump at Level 4 (Overlord shards) and 5 (drone parts), and troop losses spike at wave 20. So rally from wave 20 up, push to at least Level 4, and don’t let members settle low — one coordinated alliance push clears stages twenty solo attempts never will.