Testacles the Debug Centurion

Testacles the Debug Centurion is the secret final boss of Fallout New Vegas and the true leader of the Legion.

Background
Upon being spoken to he can: alter the Courier's Reputation with various factions of the Mojave Wasteland, spawn Rex, edit quest outcomes, etc.

Appearances
Testacles the Debug Centurion was a debug tool to test Fallout: New Vegas' functions in its development stages.

Behind the scenes

 * His name is pronounced "TEST-uh-cleez", rather than "TEST-uh-kullz" as some may think at first glance.
 * His name is a reference to a debug character featured in another Black Isle/Obsidian game, Planescape: Torment.
 * In Van Buren, there is a character named Testocles who simply berates the Prisoner, who could be countered using a skill above 5.