Common Enemy labs are a pair of research options that directly weaken the basic enemies you face in every round. By lowering their health and attack, these labs make standard waves easier to survive and faster to clear.
Description — Common Enemy Health
Common Enemy Health is a lab you unlock through Milestones by reaching tier 9 wave 10. Each level you research reduces the health of basic enemies across all waves, so they die sooner to your damage output. The lab has 30 levels in total; the exact reduction per level is listed in the cost table below.
| Level | Time | Cost | Value |
|---|---|---|---|
| 1 | 2d 7h 33m | 20,000,000,000 | -0.40% |
| 2 | 2d 15h 54m | 40,000,000,000 | -0.80% |
| 3 | 3d 0h 27m | 60,070,000,000 | -1.20% |
| 4 | 3d 9h 34m | 80,330,000,000 | -1.60% |
| 5 | 3d 19h 44m | 100,970,000,000 | -2.00% |
| 6 | 4d 7h 36m | 122,260,000,000 | -2.40% |
| 7 | 4d 21h 51m | 144,530,000,000 | -2.80% |
| 8 | 5d 15h 19m | 168,130,000,000 | -3.20% |
| 9 | 6d 12h 53m | 193,510,000,000 | -3.60% |
| 10 | 7d 15h 31m | 221,140,000,000 | -4.00% |
Description — Common Enemy Attack
Common Enemy Attack is also unlocked in Milestones at tier 9 wave 10. Researching it lowers the attack of basic enemies on every wave, reducing the damage your tower takes from standard foes. Like the health lab, it has 30 levels.
Description
Both Common Enemy labs modify the stats of basic enemies during rounds. Keep in mind that once you research them, the usual base ratios between enemy types stop holding true. For example, boss health is normally a fixed multiple of basic enemy health, but researching basic health breaks that relationship, so comparisons based on default modifiers will no longer be accurate.