Yes it’s DIBS. List of Multiplicative and Additive sources for Barb
Here’s a quick list of W6-applicable DIBS sources: Taeguk, Rend% Chest, Rend% Shoulders, Battle Rage % damage, Falter, Mutilate, Maniac, Punish, Gathering Storm, Weapons Master % damage, Brawler, Berserker Rage, and Strongarms.