You can also type "!itemhelp" ingame once you spawned. It'll show you info on some of the special abilities currently active for that class.
Some items expire after some time (the others will last forever). After an item expires you can re-buy it in the shop for a new period
And now the list:
Metal / Steel Forging


Class: Engineer
Requirements: None
Description: Restores 3 / 6 metal per second
Useful for: Anything! Don't have to go running for metal each time.
Stopwatch

Expires after 30 days.
Class: Any
Requirements: Be in an non-Arena server
Description: You respawn pretty much instantly (2 seconds)
Useful for: You drop right back in the action of course! Nice for impatient people like me!
Lock 'n Load

Expires after 30 days.
Class: Any
Requirements: Only works for weapons that consume ammo. Duh.
Description: Gives you 2x the amount of ammo at spawn or after going to a supply closet. Ammo crates won't restore more than the default amount though!
Useful for: Do you know how bloody fast you're through your grenade ammo normally?
The Invisible Man

Class: Spy
Requirements: Only refills when your cloak would normally refill (so while you're not cloaked).
Description: Faster cloak regeneration.
Useful for: Infiltration missions and backstabbing people that thought they killed you twice.
Supercharger

Class: Medic
Requirements: None
Description: Faster uber gauge filling.
Useful for: Being invincible faster than the other team.
Sapper Throw

Class: Spy
Requirements: None
Description: Allows you to throw your sapper, which will temporarily (5 seconds) disable any building in a range of a few meters. Can't be broken.
How to use: Equip the sapper and throw using the reload button.
Useful for: Quickly disabling sentries from a small distance.
Jetpack

Class: Pyro
Requirements: At least 10 flamethrower fuel. But more is advised.
Description: Allows you to use your flamethrower fuel for jetpack bursts.
How to use: jump, then press and hold the jump key again.
Useful for: It won't sent you into orbit, but it does give you enough of a boost to clear some nasty gaps and flank the other team.
Disguise Jutsu

Class: Pyro
Requirements: You need to have the Backburner equipped.
Description: You disguise as a barrel.
How to use: Hold the backburner, crouch, and press the
Useful for: It makes the Backburner twice as useful, since people are actually walking right past and exposing their backs to you! It's also damn funny.
Styptic

Class: Medic
Requirements: None.
Description: You can use your ubercharge to heal yourself.
How to use: Equip the medigun / kritzkrieg, and hold your secondary fire button.
Useful for: Healing yourself, duh!
Super Scout Bros

Class: Scout
Requirements: Be good at jumping on people
Description: Jump on an enemy's head to cause a short blackout. They'll be slower for a second and their screen will fade to gray for a moment.
Useful for: Generating hilarious scenes. More funny than actually useful, but good jumpers might get an advantage from it.
Metal Hopper

Class: Engineer
Requirements: None
Description: Build a dispenser, stand on it, and destroy it. Jump while destroying to launch somewhat higher. The blast and launch are must stronger if you upgrade your dispenser first and allow it to fill up with metal.
Useful for: Jumping to higher locations to build your nest.
Marking Shot

Class: Sniper
Requirements: Only works with the sniper rifle
Description: Any enemy you hit will get a small beacon for about 10 seconds.
Useful for: You see your enemy hiding just around the corner.
Sleep Switch

Class: Engineer
Requirements: None
Description: Allows you to put your sentry in standby.
How to use: Build a sentry, and put it to sleep by pressing the secondary fire while having the wrench equipped. During this 'sleep' your sentry will regain any lost health slowly. It's more vulnerable of course.
Useful for: You're out of metal or you don't want to spend metal on repairs.
Flying Doctor

Class: Medic
Requirements: None
Description: You can stick to your stickie-jump-happy teammates by pulling yourself towards them when they launch themselves.
How to use: Start holding your jump key just before your target launches himself. Once he's off the ground, you'll be pulled towards him.
Useful for: Healing everybody in need, no matter how far they'll fly.
Centrifuge Rotor

Class: Heavy
Requirements: None
Description: When you crouch and spin up the minigun barrel, you become practically immovable.
Useful for: You can't be airblasted or shot back easily.
Adrenaline Dash

Class: Soldier
Requirements: Need to have the shovel equiped
Description: After using the shovel taunt, you can launch enemies aside by dashing towards them. The dash is broken after a few seconds, or if you move any way but forward. Launched targets won't take damage from the launch, only fall damage afterwards.
Useful for: Break enemy formations and cause chaos.
If you guys still have questions, post them here.

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