Actually do these stones grant spiderman/ super level powers or just slightly better than human norms and maybe some special abilties just beyond the norm?
So a world with Aspect Stones should be filled with races of LionMen, TigerMen, GazellaPeople, EagleMen, and dozens of other avatar critters?
Wouldn't the items be rare these days because the stones were made so long ago? Have the technique to make them be lost to (insert disaster) long ago, and they are reminants of the forgotten tribal past. Maybe it required the hand of the old tribal gods long ago. Go to Comment
The symptoms and the death of the mages would have been big news through the magic community. The great Mage of Mulgar's tower dead and then the falling of six more powerful mages practicing the dark arts would be big news in the world.
When another plague-like death of a wizard crops up an enterprising person may take that opportunity to explore the reasons. Not being a mage, he has some safety. Over time investigating a few things he finally figures out the cause, it is an item that got transferred from one mage to another.
A robbery, pickpocket, or murder later and the inspired 'bad guy' has the possible makings of a dangerous weapon, something that will open doors for him.
Now, how to use it. All he needs to do is test the items on a few lesser known mages so he can figure out which is 'The One.' Once he has the plague causing item identified he can put his plans into action. A simple handshake is all he needs.....
Could be political intrique, struggle for power, working as an assassin for hire, or any number of things.