5 hidden Skyrim bosses you never knew were in the game

Karstaag

Karstaag Skyrim

Karstaag is a Dragonborn miniboss that can be summoned by placing his skull on his throne in Castle Karstaag, but you first have to get the skull from another location. He is an ancient frost giant and uses all the same attacks as them, however he also has a frost cloak ability that covers a large radius and inflicts all the damage and conditions of frost. He drops five filled grand soul gems that are useful for enchanters and anyone with special weapons.

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