Blizzard has released a massive blog detailing every little aspect of the upcoming new gear upgrade system in Patch 10.1.

Summary

This system:

Will be available for open world, raid and Mythic+ gear.

Will not work on PvP Gear and very top end items.

Will not work on Crafted Gear.

There are two forms of currencies: Flightstones and Crests. Crests come in 4 different varieties: Whelping’s, Drake’s, Wyrm’s, Aspect’s, each corresponding to an increasing level of difficult content.

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