Rage Serum is a Field Upgrade featured in Call of Duty: Warzone. It was added as part of Season Five of Call of Duty: Vanguard. It is available as a ground loot available in all modes.
When active, it allows the player have an increased melee damage, lunge distance and enhanced stun power when using a melee weapon. However, this in cause allows for more recoil when the player is stunned as well as louder noise coming from the operator.
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Rage Serum on the ground.