Can any spell hurt it?

[SpiderBrigade]

Gotta join on the call for Avicenex to post the full stats of this monster. Because it really does seem like people are posting solutions and then it's revealed that this won't work because of high HD or regeneration or something. Please, just lay the whole thing on the table and let the planning commence.

My personal thought is, indeed, go crazy with the sonic orbs +metamagic. We've been told that the caster fighting it is CL 50. This means you could stack up a sickening number of PRCs. Like Ramza said, look at things like Incantatrix, Halruuan Elder, Archmage, etc. There might be some interesting things to do with Shadowcraft Mage.

A level 50 build gets access to (at minimum) 10 epic feats. Since epic spellcasting is out, that'll save us some. You can do a lot with that.

Edit: @Yakk: that won't work as well as you think. Note that it's not only a weight limitation, but also 1 object per caster level, maximum 15. So you could only throw 15 bolts.