A lab upgrade that gives Poison Swamp a chance to stun enemies entering Poison Swamp. Enemies can be stunned only time into a respective Poison Swamp. However, it may be stunned again if re-entering the respective Poison Swamp or entering another Poison Swamp.
You unlock this lab in Milestones by reaching Tier 7 wave 50.
After completing this lab you also unlock the Swamp Stun Chance and Swamp Stun Time labs.
Poison Swamp Stun - Lab values, costs, and duration (1 level)