Run Flow
Enter lobby, start run, pick 1 of 2 classes, then survive scaling waves. Boss warning appears before minute 10; boss spawns at minute 10.
Level-Up System
Team-shared XP and level. Every pause (20s) gives one weapon pick + one stat pick. In co-op, unresolved picks auto-complete on timeout.
Classes & Upgrades
Arbalet, Fire, Lightning, Cannon, Shuriken. Each class has a unique ultimate and behavior tuning over shared upgrade tracks (size/speed/rate/volley/burst/pierce/range).
Survival Rules
Co-op revives: downed allies can be revived with a 3s channel and start with 2 revives. Rare drops: Magnet (collect all orbs) and Nuke (large AoE).