Demon Mode is a powerful card that provides a massive, temporary boost to your tower's offensive and defensive capabilities. When triggered, it grants a huge damage multiplier alongside complete invincibility, making it a critical tool for surviving difficult encounters and pushing further into your runs.
Description
You can trigger Demon Mode once per round. Upon activation, your tower gains a 300x multiplier to its projectile damage and becomes completely invincible. The duration of this effect scales with the card's level, lasting for 180, 200, 220, 240, 260, 280, or 300 seconds.
Use
You must activate this card manually. The optimal strategy is to wait until your tower is close to being destroyed before triggering it, as the invincibility and damage boost can help you clear the immediate threat and significantly extend your run.
If you have the Smart Demon Mode Automation, the game will attempt to trigger it automatically to save you from lethal damage. However, it follows a strict priority order alongside other automated death-prevention abilities:
1. **Death Defy:** This is checked first if you take lethal damage. 2. **Energy Shield:** If you take damage and Death Defy does not trigger, a shield charge is consumed instead. 3. **Second Wind:** If you take lethal damage and the higher-priority options are unavailable, this will trigger. 4. **Demon Mode:** If you take lethal damage and the previous options cannot activate, Smart Demon Mode will trigger. 5. **Nuke:** If all other death-prevention methods fail, Smart Nuke Automation will activate. While this does not clear projectiles already flying toward you, the v27.3 update (released December 18, 2025) added a 15-second invulnerability window to the automated Nuke effect.
Recharge Demon Mode
You can unlock the Recharge Demon Mode lab in Milestones once you reach tier 14 wave 60. This research allows the card to recharge a set number of waves after you use it, rather than being strictly limited to one use per round. The lab has 7 levels; you can find the specific recharge times in the cost table below.
| Level | Time | Cost | Value |
|---|---|---|---|
| 1 | 5d 4h 59m | 550,000,000,000 | 1,500 |
| 2 | 6d 14h 21m | 1,050,000,000,000 | 1,250 |
| 3 | 8d 54m 39s | 1,550,000,000,000 | 1,000 |
| 4 | 9d 23h 10m | 2,050,000,000,000 | 750 |
| 5 | 14d 1h 58m | 2,560,000,000,000 | 550 |
| 6 | 24d 19h 29m | 3,070,000,000,000 | 400 |
| 7 | 51d 8h 11m | 3,600,000,000,000 | 300 |