There are quite a few questions out there about the legacy experience which can then be used for rewards, based on a multiplier system. Here are some basics to understanding the legacy system: 5eu4f
Introduction to the Legacy System
What do you think of the name which all of your characters will share and you can then begin gaining Legacy experience and levels. The higher your Legacy level, the more benefits you will unlock.
So now that you know experience is needed to get anywhere in the level up in the game, you will see your legacy levels start to rise as well. The amount of legacy experience gained is calculated by multiplying your normal experience gain by a multiplier.
See a chart that fully explains this multiplier and also learn more about how to maximize your legacy experience gain here at Knotor.