Power drain

The Power Drainer is a short-range magnetic offensive weapon featured in Halo 3.

Function
The power drainer creates a short-range magnetic induction effect causes disastrous failure of powered field systems within a set radius, and is designed primarily to interfere with common varieties of field-based shielding and power generation. It also has a damaging effect on biological systems and can wound or kill most bipeds in its resulting explosion. Essentially, the Power Drainer is like a reverse bubble shield; instead of keeping the player inside unharmed, it causes any player's shields within the area of effect to drain away, making them vulnerable to harm. Unlike the bubble shield however, the power drainer will roll.

It is a deployable device that has been confirmed in the leaked internal beta build on Last Resort and in the recent public "Friends and Family" Beta Test. It has not been confirmed to be in the finalized game. The Power Drainer, like the Bubble Shield, Trip Mine, Radar Jammer and the Portable Gravity Lift, are all in the category of "Equipment" and can be deployed using the "X" Button. It is activated immediately when deployed.

Many fans are quite critical of the weapons countdown fuse, and argue that it does not allow the user enough time to escape to a safe distance before it activates and completely drains their shield.

Spawns
High Ground The power drainer can be found on a small metal ledge inside the main compound of the High Ground base. The ledge is within jumping distance of the flag spot.

Snowbound The power drainer spawns inside "Low Base" on Snowbound.

Valhalla The power drainer spawns at the nose of the pelican on Valhalla.

Its spawn location has also been seen on Last Resort in the leaked internal beta video.


 * All spawn locations are referring to the Halo 3 Multiplayer Public Beta.

Trivia

 * It shares many physical similarities with the Radar Jammer.
 * It may also be capable of draining vehicle power as well. A Bungie employee remarked that "the guy [he] just boarded used the Power Drainer to once again disable [the Banshee]."