Diablo 3’s Paragon System
Diablo III has a system that is perfect for a game where the player is allowed to create multiple characters: the Paragon system. If you haven’t played Diablo III, what the Paragon system does is allow a character to continue to earn experience after reaching the cap and provides small stat based awards to the player. What it also allows is for all other characters under that account to benefit from these paragon levels.
In The Taken King the benefits would be twofold. On one hand you have players being able continue to improve their guardians without having to reset that shiny number 40 above their heads. On the other, they now have the incentive to roll those second and third characters since they’ll have a bit of a head start in terms of ability.
It’s a way to add replayability by adding incentive to all experience, and not just for that first climb to 40 and whatever gear you may come across in Destiny: The Taken King. By providing constant growth for a guardian, Bungie would provide an infinite Legend.