The Neon Annihilator is a community-created promotional melee weapon for the Pyro. It is a neon sign with the Chinese word for "bar" (酒吧, Cantonese: Zau2Baa6, Mandarin: jiǔbā) that appears to have been torn from its permanent fixture on a wall, judging by the orientation of the characters and the fact that the base also has four thick, crooked bolts. The neon tubes on the sides of the weapon are team-colored (hydrogen for RED and mercury for BLU) and glow in the dark, as do the neon tubes inside the outer tubes, which slowly pulse between light and dark. A yellow-coloured plastic wire is seen strung from the neon lights to the back of the weapon, where it is connected via a small power compartment. An electrical sound is heard when hitting another person or a wall.
The weapon deals 20% less damage to players and cannot deal random critical hits. However, any attack on an enemy soaked in Jarate or Mad Milk, swimming, or simply standing in water of any depth electrocutes them, dealing critical damage. As enemies are considered wet for five seconds after leaving a water source, the Neon Annihilator also deals critical hits for that duration. Dealing any kind of critical hit breaks it visually, which does not impact gameplay. Furthermore, the Neon Annihilator can remove Sappers, an ability it shares with the Homewrecker and Maul, although it removes them in 2 hits instead of 1.
Enemies killed by the Neon Annihilator suffer a distinctive death by vaporization: they turn black, hover in mid-air while surrounded by team-colored particles, and then disappear into ashes. Like backstabs and headshots, there is a 25% chance that opponents will perform a specific disintegration animation if killed in this way.