Usable
From SpiralKnights
A variety of usables are available in Spiral Knights, usually purchasable at the cost of energy.
Note that, after obtaining a usable, you must activate it to gain its benefits. You can do so by locating it in your arsenal, under the Usable section, left-clicking on it, and selecting "Activate" or "Upgrade".
Upgrades
Upgrades can be purchased from the Supply Depot. Kozma also sells them since talking to her opens up the Supply Depot.
Trinket Slot Upgrade
Trinkets are a type of gear that bestow a variety of small, but useful benefits to your knight. Any player can acquire trinkets, but in order to equip them, trinket slots must be unlocked with an upgrade. Up to two Trinket Slot Upgrades may be activated at a time. Each one will unlock a single trinket slot for 30 calendar days. An activated slot upgrade will remain visible in your arsenal with the expiration date and time showing in the mouseover tooltip.
Weapon Slot Upgrade
By default, players are only able to equip two weapons when they descend into the Clockworks. This limit can be increased up to four weapons by purchasing and using Weapon Slot Upgrades. Up to two Weapon Slot Upgrades may be activated at a time. Each one enables an additional weapon slot for 30 calendar days. An activated slot upgrade will have a yellow background and remain visible in your arsenal with the expiration date and time showing in the mouseover tooltip. If you have both an activated and unused slot upgrade in your arsenal, you can click on the activated slot upgrade and use the unused slot to extend the expiration date by 30 days.
Krogmo Coin Booster
Once used, this upgrade will increase Coins earned in Coliseum games by 1 for 24 hours. You may have up to 6 Krogmo Coin Boosters active at any time.
Heat Amplifier
This upgrade doubles the user's heat gain for 2 days, 7 days, or 30 days.
Elevator Pass
Elevator passes allow players to not pay the energy fee for going down elevators for a certain period of time. They are active upon purchase.
Tanks
Mini Mist Tank
Activating a Mini Mist Tank refills 15 of a knight's mist energy and removes a Mini Mist Tank from your arsenal. Mist tanks are sent to knights by Spiral HQ via mail after a Spiral Knights player on Steam has an invited friend play through the tutorial and reach the Rescue Camp; this will happen for the first 4 invited friends to do this. They must be "Accepted" to be added to your arsenal from the mail. These tanks may also be obtained from bribing Krogmo in King Krogmo's Coliseum. Mini Mist Tanks will not allow a knight to have more than 100 mist energy.
Mist Tank
Activating a Mist Tank completely fills up a knight's mist energy and removes a Mist Tank from your arsenal. Mist Tanks are sent to knights by Spiral HQ via mail after achieving certain accomplishments and must be "Accepted" to be added to your arsenal from the mail. Mist Tanks will not allow a knight to have more than 100 mist energy.
Lockboxes
Iron Lockbox
A special prize box that contains one of hundreds of unique items that cannot be found anywhere else. It can only be opened with a Silver Key. Silver Keys can be purchased from the Supply Depot.
Iron Lockboxes are obtained as a prize from the prize wheel.
Mirrored Lockbox
A special prize box that contains one of the many unique items that modify the appearance of your Knight! It can only be opened with a Silver Key. Silver Keys can be purchased from the Supply Depot.
Mirrored Lockboxes are obtained as a prize from the prize wheel, or as a bonus for every $9.95 spent in a single purchase(that is, 2 Mirrored Lockboxes are the bonus for any purchase $19.90 or more, 3 lockboxes for $29.85, etc.) from April 18-22, 2012.
Confetti
Confetti
Use this item to throw it into the air and celebrate good times. Come on!
Confetti is obtained by buying it from Bulky for 300 crowns during the Caketastrophe event. It is one of the few items available from the event that does not expire. Using it makes the knight display the /shout animation and creates confetti identical to the confetti released from treasure boxes.
Leaf Confetti
A fantastic party favor used in forest festivities.
Summer Confetti
When thrown, this summer confetti makes you feel all warm inside.
Winter Confetti
When thrown, this winter confetti gives you quite a chill.
Body Modifiers
Eyes
Eyes allow a player to change the shape of their eyes.
Height Modifier
Height Modifiers allow players to alter the height of their character.
Personal Color
Personal Color allows a player to change their personal color.
Keys
Silver Key
A special key that can open any lockbox. Silver Keys can be bought from the Supply Depot or Kozma for 750 energy, and are destroyed once used.
Shadow Key
A special key that can unlock the elevators into the Shadow Lair. It is obtained from Iron Lockboxes, or contests. Only one is needed per party to unlock the Shadow Lair elevator, but are destroyed upon use.
Shadow keys are tradable and can be sold in the Auction House.
