Greater Lycanthropy (4e Feat)
From D&D Wiki
Your wolf form is more powerful
Prerequisite: Fenrirborn, Lycanthropy racial power
Benefit: When you and at least one other ally are both adjacent to the same enemy, you deal 1d4 extra damage for each ally within 3 squares of you, maximum of 2d4 damage. At level 11, the max increases to 4d4, and at level 21, the max increases to 6d4.