Brutal (4e Future Equipment)
From D&D Wiki
Level 4 Average Weapon Mod Equipment
Cost: 175 credits
Weight: - lb
Benefit: When you roll the damage dice for this weapon, you re-roll dice that show a particular value or less until they are greater than that value. For weapons with [W] of 1d4, 1d6 or 1d8, you re-roll dice that show a 1. For weapons with a [W] of 1d10 or 1d12, you re-roll dice that show a 1 or 2.
The minimum amount of damage this weapon causes is greater than normal. It might have multiple impact points, or be better at turning a glancing blow into penetration.