Semtex is a type of lethal grenade containing C4 that sticks to the first surface it touches, including other players, before exploding. It is featured in Call of Duty: Modern Warfare 2, Call of Duty: Black Ops, Call of Duty: Modern Warfare 3, Call of Duty: Black Ops II, Call of Duty: Black Ops: Declassified, Call of Duty: Ghosts, Call of Duty: Advanced Warfare, Call of Duty: Black Ops III, and Call of Duty: Infinite Warfare.