Regular Event Stages · 2 stages
When it opens
- Sep 16–Oct 1, all day
| # | Stage | Boss | Enemies | Rewards | Base HP |
|---|---|---|---|---|---|
| 1 | Old Master (Expert) |  Boss Iron Claw X |       |  5% | 600,000 |
| 2 | Old Master (Insane) | - |    | 100% | 800,000 |