I just recently got to this part of the game... and Hellspikes is too funny. I try and run around and get as many of them bunched up at one time as I can, 30 is about as many as I can get to stay in one spot (running circles). Then I just bust em up with a lot of hellspikes, they all die in 1/2-3/4s bar of mana, I hit my restoration potion and go on... I sure wish there were more of these. I do the samething outside with the lizard hordes. I've found Hellspikes to be slightly less dmg than elemental hail, but less mana as well. I can get the Hellspikes to hit more creaters at once though, ends up killing them all faster... and you are 100% sure that it will kill anything you hit with them since they are unresistable. Just running around the Dark Forest at level 28... look up and im level 33.
Calonderiel