I went to investigate and got all the information on the pre-existent Evony exploit. Hundreds of players were using a cheat to gain abnormal prestige in unrealistic time.
The bug was discovered when a player decided to crash 1,000 warriors into a high level NPC. That player lost all the warriors but enjoyed a boost of 2,000 prestige. The reason for this is because the troop value of 1,000 warriors was a lot less than what the player was able to kill with those warriors. Thus, the player’s prestige went up quite a bit. That player told his/her alliance and it spread from there. People started gaining prestige in hundreds of thousands every day. The exploit had gone too far. Evony patched the cheat and people who used this continuously had their prestige reset to 0.