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5 Skyrim hidden bosses you need to find if you really want to complete everything

Sure, completing the story might feel like finishing things, but unless you find and defeat these fauve hidden Skyrim bosses did you really? There's a hidden dragon, a glacial giant, a vampiric demon, and more if you know where to look in Skyrim (opens in new tab). Which is where this hidden bosses guide comes in. All of the creatures we're going to cover are just spoiling for a fight with the Dragonborn, and will give even the most hardened adventure a challenge. So, before you retire to your Thane's mansion and hang up your weapons for good, follow our Skyrim hidden bosses guide for some epic battles and final closure.

1. Vulthuryol the dragon

Blackreach is a stunning cave underneath the Tower of Mzark, filled with luminous blue mushrooms, soft lighting, and towering Dwemer ruins. Blackreach also has a hidden, level 50 dragon boss named Vulthuryol, who you can summon by yelling the Unrelenting Force Thu’um at the giant globe which hangs from the cavern ceiling. If you summon him but decide you don’t fancy a fight just yet, he’ll go off and swoop around killing enemies in Blackreach until you initiate combat. Thanks Vulthuryol!

2. Karstaag the Frost Giant

Some of you might be in for a nostalgia trip here, as this boss is a throwback to Morrowind. If you're playing the original release, the ruins of Castle Karstaag can be found in the Dragonborn DLC in the north-west of Solstheim, and are in a bit of a sorry state. They’re now in a cave instead of their former, magnificently glacial form. During the events of Morrowind: Bloodmoon, the castle was lorded over by Karstaag, a frost giant, and his Riekling minions. But now all that remains is a solitary throne. If you find Karstaag’s skull at the back of the Glacial Cave and put it on his throne, you can get a brief glimpse of his ghost. And I mean brief, because he’s level 90 and will destroy you unless you prepare before charging in.  

3. The Reaper

He comes for us all, but this one can be specifically found in the Soul Cairn from the Dawnguard DLC. When you’ve been granted access to the Soul Cairn, gather three Reaper gem fragments. You can find them underneath the big purple crystals which, be warned, drain your health. As if that wasn’t incentive enough to stay as far away from the Reaper as possible, once you’ve got all three you’ll need to put them on the altar in the Reaper’s Lair, an ominous-looking black building. Once summoned, the hooded Reaper will spout green slime and has Bonemen minions, and his difficulty will increase depending on your level - so make sure you stock up on potions, decent armour, and weapons before you take him on. 

4. Ebony Warrior

A good quest for those of you who don’t like to search for things to do in Skyrim, the Ebony Warrior will seek you out himself. He likes a fair fight though, so he won’t come anywhere near you until you’re level 80. Once you reach it, however, he’ll hunt you down and challenge you to a duel to the death. You’ll soon be growing cold in a pool of your own blood if you’re not careful, as The Ebony Warrior is the real deal: he’s immune to a heap of shouts, he’s got similar perks and abilities to you, and he’s got 50% resistance to shock, frost, and fire damage. Plus he can cast spells. And he can use two dragon shouts: Disarm and Unrelenting Force. The Ebony Warrior is not an encounter for the faint hearted, but once beaten his enchanted armour, weapons, and jewelry are well worth the trouble. 

5. BONUS: Strange orb 

So this isn’t a boss exactly, but it’s certainly an encounter which you won’t want to miss. At the eastern-most edge of the map you’ll find the Dwemer ruin of Kagrenzel, which you should enter before simply following the hallway. Eventually you’ll reach a large chamber strewn with bandit corpses. There’s a strange light in the centre of the room, so go and touch it. I’m not going to tell you what happens next, but you should probably save your game beforehand. Have fun!

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While here at GamesRadar, Zoe was a features writer and video presenter for us. She's since flown the coop and gone on to work at Eurogamer where she's a video producer, and also runs her own Twitch and YouTube channels. She specialises in huge open-world games, true crime, and lore deep-dives.