Aspect of the Rampaging Werebeast is a Druid Offensive Aspect that can be found by completing the Endless Gates Dungeon as well as from random enemy drops. After clearing the Dungeon for the first time the Aspect will be available in your Codex of Power.
How to Obtain - Codex of Power - Endless Gates
Aspect of the Rampaging Werebeast Mechanics
Legendary Aspects can change the way skills and builds work in significant ways.
The Critical Strike Damage increase while Grizzly Rage is active is additive and stacks up to 99. This means that the maximum Critical Strike Damage stat you can get out of this Aspect of the Rampaging Werebeast is 990% when reaching 99 stacks.
For further information, see our Build Guides, Legendary Aspects & Codex of Power
Aspect of the Rampaging Werebeast