Talk:Colosseum/@comment-85.168.119.76-20130612170035/@comment-216.52.207.123-20130612174455

it's a % of the XP needed to get from Level X to Level Y - if you need 500,000 XP total to get the next level you'll earn either 50,000 or 25,000XP for Gold & Silver until you reach the new level.