Yeah, knives.
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Appearance and grip
It's a knife, but it's a toy one, made of foam. (imagine a black nerf bayonet) It is held with a reverse grip usually
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Abilities
Stabbing: Basic melee attack, smaller range then the sword. The hitbox is bigger than the model to make it possible to hit something with it. Only some of the damage will be tooken by shield, the rest dealing damage to health. This applies to all attacks.
Throwing: Hold down a button and you will hold it with a standard grip. Press the drop button to throw it, with slight homing capabilities. A thrown knife cannot be picked up until it touches something, where it acts like it was droped
Backstab: If you are behind the target and attack, it will deal way more damage, one hit killing players and most AI
Mounting: Put it near a weapon and it will stick to it, working like an actual bayonet. If attached to a laser grenade or paint mine and said object explodes, it will fly out at the same speed as the particles, working as if it was thrown