Rampancy is the enhanced self-awareness of a computer AI, causing a progression towards greater mental abilities and destructive impulses. The destructive impulses, however, are primarily caused by being threatened or harassed. In the Marathon Trilogy, rampancy seems to occur most often with AIs with limited jobs. For example, the AI Durandal's only job on the UESC Marathon was opening and closing doors. When Durandal became intelligent enough to realize that opening and closing doors was the entirety of his existence, he became rampant.