Unique potion.
-It's said who drinks this potion unleash its latent power.
Effect: stuns all enemy in 3 range for 3 seconds leaving the tower unable to attack for the rest of the wave. + 0.05 per level.
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Hope you like this idea I came up with, maybe 3 range is too much. I'll leave that to somebody more experienced. I would appreciate your thought about it. Have a nice day. :)