Barbarian (Fallout Supplement)
From D&D Wiki
Grognak the Barbarian is a series of comic books published by Hubris Comics in the mid-21st century. The comic books relate the adventures of the titular character in a prehistoric world.
Benefit: Increases Critical Hit damage incremental by +5% when attacking unarmed or with melee weapons per rank.
Special: The magazines consist of a 10-issue run that each give an additional rank of the Barbarian perk, which raises the critical damage of unarmed or melee attacks by 5%. This stacks together to gain up to a 50% increase in melee or unarmed critical damage, if all comics have been found.