Fast Enemy Labs are a set of milestone-unlocked lab researches that weaken fast enemies during rounds. Each lab targets one stat — health, attack, or speed — and applies its reduction at every wave, making fast enemies easier to manage as you progress.
Description — Fast Enemy Health
This lab becomes available through Milestones once you reach tier 9 wave 20. Researching it lowers the health of fast enemies across all waves, so they take fewer hits to kill. It has 30 levels, and the per-level costs and effects are shown in the table below.
| Level | Time | Cost | Value |
|---|---|---|---|
| 1 | 2d 7h 33m | 30,000,000,000 | -0.40% |
| 2 | 2d 15h 54m | 60,010,000,000 | -0.80% |
| 3 | 3d 0h 27m | 90,070,000,000 | -1.20% |
| 4 | 3d 9h 34m | 120,330,000,000 | -1.60% |
| 5 | 3d 19h 44m | 150,970,000,000 | -2.00% |
| 6 | 4d 7h 36m | 182,260,000,000 | -2.40% |
| 7 | 4d 21h 51m | 214,530,000,000 | -2.80% |
| 8 | 5d 15h 19m | 248,130,000,000 | -3.20% |
| 9 | 6d 12h 53m | 283,510,000,000 | -3.60% |
| 10 | 7d 15h 31m | 321,140,000,000 | -4.00% |
Description — Fast Enemy Attack
Unlocked in Milestones at tier 9 wave 20, this lab reduces how much damage fast enemies deal at every wave. It has 30 levels, letting you steadily chip away at the threat fast enemies pose to your tower.
Description — Fast Enemy Speed
This lab unlocks later than the other two, at tier 9 wave 300 in Milestones. Each level slows fast enemies down at all waves, giving your tower more time to hit them before they reach it. It has 30 levels, with details in the table below.
| Level | Time | Cost | Value |
|---|---|---|---|
| 1 | 2d 18h 39m | 60,000,000,000 | -0.40% |
| 2 | 3d 3h 1m | 120,010,000,000 | -0.80% |
| 3 | 3d 11h 34m | 180,070,000,000 | -1.20% |
| 4 | 3d 20h 40m | 240,330,000,000 | -1.60% |
| 5 | 4d 6h 51m | 300,970,000,000 | -2.00% |
| 6 | 4d 18h 43m | 362,260,000,000 | -2.40% |
| 7 | 5d 8h 58m | 424,530,000,000 | -2.80% |
| 8 | 6d 2h 26m | 488,130,000,000 | -3.20% |
| 9 | 7d 0h 0m | 553,510,000,000 | -3.60% |
| 10 | 8d 2h 38m | 621,140,000,000 | -4.00% |
Description
Fast Enemy labs directly alter fast enemy stats while a round is running. Keep in mind that researching these labs breaks the default stat relationships between enemy types — for example, boss health is normally a fixed multiple of basic enemy health, but once you start modifying one type's stats, those built-in ratios no longer hold.