Custom Powerup
From Halopedia, the Halo wiki
The Yellow Powerup is an object in Halo 3, similar to the Active Camouflage and the Overshield.
Overview
This object is only found in Forge. What it does is decided by a player in Forge. It can affect many player attributes, such as damage resistance, gravity, damage, etc. It can make a player an "instant Juggernaut", or even negatively affect a player.[1]
