As I recall it worked very similarly to Buffs, in that a better version of a spell would overwrite a lower version. And, while some dots and dbuffs did stack, it was only occasionally, for instance I think rangers had a spell that was very nice specifically because it DID stack with others spells of it's type (I can't remember the spell and will have to call up my ranger friend on the phone to get the name but the only thing that is important is that very few spells stacked that acted in similar ways) I always understood that a great deal of R&D + testing went into how spells stacked and what stacked with what. It was one of the top 5 reasons raid planning was essential and brought depth and dynamic interplay to how classes interacted together and played specific rolls in groups.
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