Dungeons & Dragons (4th Edition) adventures published for PCs from level 11 to 20
From the PHB:
In the paragon tier, your character is a shining example of heroism, set well apart from the masses. Your class still largely determines your capabilities. In addition, you gain extra abilities in your specialty: your paragon path. When you reach 11th level, you choose a path of specialization, a course that defines who you are within a certain narrow range of criteria.