Rat King - Destinypedia, the Destiny wiki

Rat King is an exotic kinetic sidearm in Destiny 2. It's main perk is Rat Pack, which causes the gun's power to increase when more players with Rat King are nearby. Rat King was acquired by completing the Exotic Quest Rat King's Crew, which was unlocked after completing the Titan World Quest. Nowadays
Rat King is an exotic kinetic sidearm in Destiny 2. It's main perk is Rat Pack, which causes the gun's power to increase when more players with Rat King are nearby. Rat King was acquired by completing the Exotic Quest Rat King's Crew, which was unlocked after completing the Titan World Quest. Nowadays

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