Players can pin 
Restless Rot in their Materials tab for easier tracking. By favoriting the material, it will appear at the bottom of the the inventory, eliminating the need to switch to the Witchcraft tab repeatedly.
Thanks to AirsoftDaniel for the tip!
PSA: If you open your materials tab you can pin Restless Rot
byu/AirsoftDaniel indiablo4
Restless Rot drops from Headrotten enemies in Season 7 and is used to upgrade Witchcraft Powers.