Rampage
From The Unofficial Outwar Wiki
About
Increases your chance to double strip and gain strength when attacking a player.
Frenzy
Increasing your rampage over 100% will also increase your "Frenzy" stat which further Increases the amount of experience stripped and gained when attacking a player. Every 100% additional Rampage you have over the first 100% will add 10% Frenzy
Ways to Obtain Rampage
Brutal Warrior: Level 75 Enhancement, Upgrade purchased on the treasury with 2.5m experience for each 5% with a cap of 30%.
Crest of Affliction: Level 2 gives 30% rampage Level 3 gives 90% rampage.
Chaos Gem: Gives between 1-100% Rampage depending on the level gem you have.
15% Rampage: Character upgrade purchased on the treasury for 50 Player Bound points
Augments: Not all augments give rampage but most do.