An "Ambush" item that increases crouch speed

[A Bear]

Useful for sneaking up to enemies without them hearing you, or sometimes sneaking away when being chased.

Could be a weapon item with other benefits that encourage sneaking up on enemies.

 

[pakshin55]

Invisibility is in general bad design, best people come up with is making it visible through human pattern recognition(this game and heroes of the storm). Now you want to half chances to spot it due to figure being halved and not emit a sound. This is bad and toxic to people against it.

 

[g-alb-ert]

The 3rd person view is already good enough to sneak.
I would make footstep sounds better and clearer, then make an item that makes these sounds quieter