The summoned ones are steel scorpions, which ones are you killing in 2 blows, Nik? The normal(orange brown) or the steel ones (they look white)?
Kiya

http://kiya1.via.t-online.de/images/Div_Scorpion.jpg

pic link, steel scorpion is in the left part. Have you freed Elona already? In the cemetary of the poor quarters? IIRC there you meet your first steel scorpion.