The top reasons for dying to towers, is you get shockstunned, stunned, or slowed by ice novas, and the arrows rip you up, while your being parasited, for that situation a flame/ice/light pot combined with SS+7/8 come in handy to boost all your resistances and HP, dreadshield+7 is going to be of the tops by taking tank damage. but really you only want to live long enough to get tped out. it's between a dreadshield and SS+7 depending on which you can afford, dreadshield is probably better because it's not only good for tanking towers, and dreadshield can be used for multiple situations.