Katana

"I'm grabbin' this ninja sword. Anybody see some nunchucks, gimme a holler."

- Ellis

"Shit. I'd pay cash money for this."

- Coach

The Katana (also erroneously called the Ninja Sword by some Survivors) is a close combat weapon in Left 4 Dead 2.

It spawns in the following campaigns:
 * Dead Center
 * The Passing
 * Dark Carnival
 * Hard Rain
 * No Mercy
 * Dead Air
 * The Sacrifice
 * Cold Stream

The Katana is classified as a slashing weapon. As such, hits from this weapon will sever limbs and splatter blood.

Pros

 * Other than the Machete, Nightstick, and Golf Club, all of which are only available in a select few campaigns, and the Chainsaw, which is a rare weapon with limited fuel, the Katana has the fastest fire rate of any melee weapon.
 * Wide arc of swing, allowing for multiple Infected to be killed in one swing.
 * Extremely fast swings

Cons

 * Very rare find. Sometimes it does not spawn at all in a campaign.
 * Covers the screen with blood since it is a slashing weapon.
 * Not recommended for killing Boomers due to bile showering attacker and any nearby Survivors.