Even after all of these years, players are still coming across new and interesting findings in The Elder Scrolls V: Skryim. A new post that’s been flying about the web since morning reveals that the game has three hidden bosses. For those who have already spent a hundred hours exploring the vast lands of the game, here’s something else you can achieve.
Vulthuryol is an ancient dragon that can be found in Blackreach. To summon him, you have to use your Unrelenting Force shout on the orb inside Blackreach.
Karstaag can be found in the Dragonborn DLC in Castle Karstaag Ruins. To summon him, you must retrieve his skull from the back of Glacial Cave. Once you have it in your possession, simply place it on his throne in the Castle Karstaag Ruins. He packs quite a punch and you should be fully prepared before summoning him.
The Reaper can be found in the Dawnguard DLC, within a building in the Soul Cairn. To summon him, you must gather three Reaper Gem fragments. Once you have them in your possession, place them in the alter inside the building.
Thanks to Reddit user davidkones for pointing out the location of the bosses.