As far as a class based around conjuring/summoning, the key things we've tried to explore in that direction is to make the beings called somewhat independent and free-willed. You can bring them to you, and make them stay, but they do their own thing, and you have to manage your relationship with them. Force your lesser archangel to kill innocents? Probably a bad plan. Letting your demon go hungry? Also bad.
If it's to be the focus of the class (we have a few classes that can keep beings around to help them, but one in particular that is structured around it), they need to be more than just things you can order around, otherwise the overhead of trying to control them all is annoying for the player.
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