The thunderlord doesn't miss it. Probably. Best not to ask. Found in Collapsing dungeon chests.
Tier 4
farpoint Beacon T4 Chest Master Table · about 0.17% per roll
Use it in a build
The planner works out what this item is actually worth to the abilities
you run — which attributes it feeds, whether its tagged rolls match anything you
have equipped, and how it compares against what is in that slot now.