The Fight Dirty upgrade in TDS increases the duration of debuffs applied to enemies, so effects like burns, stuns, or other lingering status effects last longer.

In practice, that means towers with damage-over-time or crowd-control effects get more value from each application because enemies stay affected for longer. Some players also describe it as a strong pick for towers that rely on debuffs rather than raw damage.

Quick Scoop

  • Fight Dirty = longer-lasting enemy debuffs.
  • It helps status-effect towers get more mileage out of their effects.
  • Community takes are mixed, but it’s generally seen as useful rather than flashy.

If you want, I can also list which towers benefit the most from it.