i was thinking to an acid tower, working like the slow , but it slow them a bit, and damage them,

the acid should slow them less than the ice

what do you think?

Ya, not bad. I remember in warcraft 3 there were poison towers and frost towers... if a creep was hit by poison, they slow down. If they were hit with the frost tower, they'd slow down as well.... however, if hit by both, the creep would almost stand still.

yes, but i was thinking of a area tower, not a shoting one, i think this could be amazing :)