Blight red maps not for solo?

For me, Arc Towers + lvl 3 empower (lvl 4 doesn't support the towers anymore) work very well in order to thin out the masses.

Freeze towers slow down the crowd, but if you can't deliver the necessary area dps, this is worthless, because you only increase the mob density in that area.
And for the cage towers, keep in mind that most skills that doesn't hit from above (e.g. firestorm) can't pass the barrier. Sure, Meteor Towers also shoot inside, but if you're sitting with a ranger and tornado shot outside, you can't hit the bosses anymore.

Did an alched t15 solo no problems yesterday on a mjolner Ball lightning/cwc ball lightning cyclone guardian. Just use tower cost reduce oils and spam towers everywhere.

Blighted maps are funny :D

people usually think that for example monster/bosslife, monsters resists or phys reduction are free quantity.

on blighted maps you actually want to get as much monsters damage as you can get and avoid those things above :)