It is rather annoying to be halted in conquest when your Amurite vassals stop your primary siege equipment (cultists) from being able to do their job. It would be preferable if some check could be built into world spells so that they do not negatively effect members of your own team. This would probably (I haven't checked if any of them already have checks for teams) include the Illian's, Amurite's, Lanun's, Calabim's, and Sheaim's world spells. Possibly others that I've missed. It makes sense that your teammates do not receive the benefit of a cast spell (not that many of them really give a benefit), but it would certainly help if you are at least not hindering those you should be helping.