Defeating the spider on impossible

[iregev]

I usually do it with no losses around level 15/16
Simmilar strategy to what Zhuangzi decribed but perfect it wich Necro Call on the dead spiders every time you can (instead of ghost blade) With Shamams and Necro call the field covers up rather quick and besides the spider queen just loves attacking the undead spiders near her.
Also when the green spiders attack your decoy spiders they get poisoned (freee mana with mana spring.)

So basically my stragey is actually to focous on the green spiders at first build up a baricade of dead spiders and shooters kill the queen.