Greater Malison Combo
If you cast greater malison (reduces all saves by 4), followed by slow (reduces saves vs magic by 4 if successful), followed by glitterdust (reduces all saves by 4 if successful) and the target fails the two saves, will they have a -12 to saves for the next 4 rounds? Or did I misunderstand something

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Regardless, if you're correct about them applying those penalties, there's no reason they wouldn't stack.
I see no mention of saving throw penalty in the glitterdust spell desc so if it does reduce them it's probably a bug.
Nope