Ninja perks is a must-have for Call of Duty: Vanguard on Playstation 4 (PS4)

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Someone using a good audio setup or headset can have a substantial advantage over the competition by being able to hear enemy footsteps. 

You may be able to reduce how often you die when someone hears you coming by using the Ninja perk, which is unlocked at level 15. This enables you to make your footsteps silent and reduces your fall damage.