[MaxWilson]

Aha. Yes, the combat AI does do a friendly-fire calculation. Am I correct in thinking that the Mother of Tuathas is a low-HP unit? I think the "value" of an arty spell is primarily determined by how much HP damage you do and not so much who you do it to--if she is surrounded by Ulmish warriors most of the HP will be done to Ulm (especially because most of the time it will ONLY hit Ulmish warriors because of Prec).

I'm guessing that if you check the debug log it will have a bunch of lines that say "Friendly Fire" and decline to cast Magma Eruption. It's kind of perplexing that they would run all the way up to melee, though. Note also that the friendly fire calculation is a little bit weird anyway, because at close range you're supposed to be 100% precise according to the manual (under Prec/2 distance?) and yet Agarthan Stone Throwers and such will often engage in melee instead of throwing boulders, presumably because of friendly fire issues. I don't fully understand it.

-Max