The Holy Hand Grenade causes significant amounts of damage and will typically kill any worm nearby. Its shockwaves will cause damage to worms through landscape, and can knock a worm over a ledge. The shockwaves can also launch a nearby worm across the screen, usually with enough force to cause death.
Before it explodes, the Holy Hand Grenade emits a cloud of purple vapor, and a choir of angels sings Hallelujah!
The name of this weapon references the Monty Python movie Monty Python and the Holy Grail.