That's the main problem. I talked to Delf a while back and the main problems that concerned him with summoning skills are:I think the real challenge with this kind of skill is the AI. I'm not certain, but I think that was the determined problem.
Necromancers could spawn allied skeletons in the map of Zeal, 2 years ago. However the skeletons were not of any use except for consuming it for mana (Back then Necros could consume undead mobs for mana). As mentioned earlier, the problem was that the skeletons will attack anyone except for the necro, even if they are in the same party as the necro.I have heard a few times that necromancers are getting an ability that spawns skeletons, is this true? I think it would be a great idea considering that's what a necromancer is.