are 'plebeian classes'. The executive political leadership is split between the Lord President, who keeps the ceremonial relics of the Time Lords, and the Chancellor, who appears to be the administrative leader of the Cardinals and who acts as a check on the power of the Lord President. The President is an elected position; on Presidential Resignation Day, the outgoing President usually names his successor, who is then usually confirmed in a non-contested "election", but it is still constitutionally possible for another candidate to put themselves forward for the post, as the Doctor did in The Deadly Assassin. In that story, the Presidency was described as a largely ceremonial role, but in The Invasion of Time the orders of the office were to be obeyed without question. In the event the current Lord President is unable to name a successor, the council can appoint a President to take his place. In The Five Doctors, the council appoints the Doctor as president after Borusa is imprisoned by Rassilon, and later deposed him after he neglected his duties. The President and Chancellor also sit on the Time Lord High Council, akin to a legislative body, composed variously of Councillors and more senior Cardinals. Also on the High Council is the Castellan of the Chancellery Guard, in charge of the security of the Citadel, whom the Doctor has referred to as the leader of a trumped-up palace guard. According to the constitution, if while in emergency session the other members of the High Council are in unanimous agreement, even the President's orders can be overruled. Technology The Moment was claimed by the Time Lords to be the most powerful weapon in the Universe and capable of destroying entire galaxies. The Moment was locked in Gallifrey's Time Vaults, specifically in the Omega Arsenal. The Moment is so powerful that the weapon's operating system became sentient, leading the Time Lords to wonder "How do you use a weapon when it can stand in judgement of you?" and that "only one man would be mad enough to try it". In the 50th anniversary special "The Day of the Doctor", the War Doctor breaks into the Omega Arsenal, steals the Moment and is about to destroy both Time Lords and Daleks alike to stop the Time War before the Moment engineers a meeting with his succeeding regenerations to convince him otherwise. Another impressive example of Time Lord