Thundering Rage

From Neversummer 4 Wiki

Type of Feat: (Epic) General

Prerequisite: 21st level, Greater Rage, Str 25

Required for: None

Specifics: Any weapon the Barbarian wields while in a rage does an additional 1d4 Sonic damage at all times, and an additional 2d6 points of physical damage on a critical hit. There is a 25% chance for a creature hit by one of the barbarian’s weapons to be Deafened for 3 rounds.

Use: Automatic while in Rage.

Thundering rage's massive critical property will not stack with overwhelming critical. Any weapon that has the property of massive critical will override any bonus you get from thundering rage's massive critical property.