You know in any RPG game you fight alone,sure you can conjure some skeletons but you dont have one ally who fights with you,rather you have "passive allies"
I.e those who will attack a creature who is attacking you only if you draw the creature into where they are patrolling.
E.g
Say you are wandering in the sewers and find a warrior who is waiting outside what he knows to be a place of treasure.
You engage in conversation and he says that he wanted revenge for the killing of his freind,say.
Unfortunately his companion has died and so he asks you for help.
You agree and when all the creatures are dead you get to split the treasure.