There's a rule against necromancy, but what about summons or magic that behaves as a controlled entity?
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Summons are possible, but they are not controlled. Any spirit that is summoned retains its free will. It is possible to summon “constructs”, which are objects made purely of Chaos (mana), that can be controlled, however, as per its name, Chaos is unstable and cannot make anything very big. See; Spirit Flower and Vomits Spiders on my reply below for examples.