Energy Vortex and blade spirit have both been modified from their original rules on OSI.
Energy Vortexes and Blade Spirits will set prioriety targets depending on whether they are cast nearest to PC or NPC targets.
We’ve made a return to Energy Vortex choosing high int targets, and Blade Spirits choosing high dex targets. We’ve also made a return to a complete lack of immunity from either summon. The caster and his guildmates are equally probable targets.
In this case, the summon will continue to attack targets of the type it was summoned near until it exhausts those targets. At that point, the summon will move on to any other type of NPC in the area.
In either case, if the summon runs out of targets, there is a good chance it will choose to go after whatever is left.