not a one time thing. they are really really good, as you kinda need troops to run over them for the damage debuff
make sure you put them in good spots
and make sure you reset them after each battle
All troops receive this debuff as long as they are inside the aoe. I had an infantry set one off and the rest of my army followed shortly after. It was like going over a speed bump.
All troops receive this debuff as long as they are inside the aoe. I had an infantry set one off and the rest of my army followed shortly after. It was like going over a speed bump.