Skip to main content. An official website of the United States government. The .gov means it's official. Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you're on a federal government site. This site is secure. The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.
It is possible that some NPCs scale to very high levels. J'zargo (the companion) is rumored to level up with you until 81 at least and I see no reason why this couldn't be the case with other NPCs too. As always though no accurate answers from me :).
How to obtain the power, Summon Karstaag, and it's related quest in The Elder Scrolls V: Dragonborn DLC for Skyrim. The power grants the ability to summon a powerful Frost Giant named Karstaag to fight for you for 120 seconds. NOTE: He can only be summoned THREE times. After that, the ability will no longer be available. To obtain the power, you must locate Karstaag's Skull in Glacial Cave and place it on his throne in Castle Karstaag Ruins. This summons the beast which you must then fight. Once he has been defeated, the power is received.