Oh this is a good one, we get a cursed item, we get a dangerous spell, we get a gory little story, we get some NPC ideas and we get them all tied together is nice neat little bundle.
It could see this as a plot device,
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Mages are dying all over the court, some think a magical attack, others a curse of the gods (or their judgement) but it is really the pocket silk has somehow found its way to magic academy. I picture a final fight scene on a windy tower with the silk blowing in the wind, the PCs trying to grab it safely, the vengeful mage hater trying to let it go or maybe an ancestor Mulgar.