When Skyrim was released players were limited to a level cap of 81 because of the way that skill progression worked originally. With later updates (and in Skyrim Special Edition) this skill cap was removed with the introduction of the Legendary Skill system.
RELATED: Skyrim: How To Get To Raven Rock
Legendary Skills in Skyrim are not unique skills unlocked late in the game, nor are they improvements on existing skills and abilities pertaining to each skill line. Legendary Skills are simply a
Read more on gamerant.com