The Barbed Bomb is presumably an unreleased explosive consumable that may come in a later patch. It is seen on the official website on the Hunter's desk.

Deadly when thrown, this crude and cruel homemade grenade features a 360o impact trigger that sets a short fuse. Once lodged into a surface, for instance flesh, its prongs ensure that it sticks in place long enough for the explosive to go off.

This may also refer to the as-yet unreleased Sticky Bomb.

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