Custom Powerup

The Custom Powerup is an object in Halo 3, similar to the Active Camouflage and the Overshield.

Overview
This object can only be placed on maps by using Forge. What it does is decided by a player when setting up a custom gametype. But by default, it increases the player's speed. It can affect many player attributes, such as damage resistance, gravity, damage, etc., including multiple simultaneous effects. It can make a player an "instant Juggernaut", or even negatively affect a player. It will appear as a floating yellow orb, and its effects can be edited by clicking 'x' at the custom games lobby to go to game options, and then to the bottom of the 'weapons and vehicles' tab. MLG have their own custom powerup which provides 3X Overshields in their official MLG playlist.