User blog comment:Jimeee/Skyrim 1.9 beta update adds Legendary difficulty and raises level cap (Updated Apr 8th)/@comment-180.194.244.49-20130410182036/@comment-3124449-20130411043445

In the skill menu, you can choose to make a skill that has reached 100 legendary. After resetting, your perks are returned (you CAN reuse them), the skill is reduced to 15, and a symbol is added under the name of the legendary skill (Empire dragon symbol/TESV Skyrim box cover).