Since most PKers are red, Shal'ille spells are most effective against them. Umbrella will hurt Qor casters quite badly. Resist Magic (Kraanan) will deflect enfeeble, and other evil spells, and all healing spells and the wand of healing will reduce Qor followers' HP, instead of increasing (when the Qor followers have vamped up their HP over the maximum). The hard lessons are: never hang around the Flatlands in the dark; when attacking normal beasts, have your back against the wall (so you might catch a glimpse of a near-invisible PKer).