Beware parasitic spells: Drawn to conduits of mana like practitioners, they attach themselves to larger spells to hitch a free ride, force themselves into invocations as intrusive thoughts
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Rare but dangerous are spells that compel the caster to cast them again and again, burning all their mana if a counterspell is not found quickly
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Others are more subtle about it, exploiting pragmatic ambiguity or encrypting themselves, hiding in externalities so that down the road, someone may come up with the same flawed spell again