Tail Nail

Stay put! The  is a melee weapon available in Worms 4: Mayhem, and can be used to pin down a troublesome wriggler, preventing them from creeping to safety, fetching an important crate, or moving into an opportune firing position. When used, your worm bashes an enemy on the head with an enormous wooden mallet, burying them in the ground and preventing them from moving. The only means of escape for the victim is either to use a Teleport, or an explosion carves out the piece of terrain that they're currently rooted in.

Even if a worm is rooted by the Tail Nail, they can still rotate in place and operate weapons as normal. They will not, however, be able to use certain utilities, such as the Jetpack or Icarus Potion.

Despite the name, no actual nails are used in the operation of this weapon.

Using the Tail Nail
Simply select the Tail Nail from the weapon menu, approach an enemy worm, and press the fire key.