Crusader of Atom

Crusader of Atom is a perk in the Fallout 4 add-on Far Harbor.

Obtaining
This perk is given as a possible reward for the quest Cleansing the Land for destroying Far Harbor on behalf of the Children of Atom.

If either The Heretic or Witch Hunt was resolved aggressively, the player will receive the title of Inquisitor and the perk Inquisitor of Atom as rewards. If they resolved both quests peacefully, failed them, or avoided them altogether, they will instead receive the title of Crusader and the perk Crusader of Atom instead. Both perks have the same effects, and the difference is merely how some NPCs address the Sole Survivor.

Effects
Provides a bonus to your weapon's damage. For every 100 Rads, damage is increased by 10%. Additionally, starting at 900 Rads, the damage is increased by a total of 100%.