Summoning Karstaag - The Elder Scrolls V: Skyrim Guide - IGN

is an unmarked quest in Skyrim's Dragonborn DLC. Karstaag is a secret boss, much like The Ebony Warrior. The quest involves finding the skull of Karstaag

Karstaag, Unmarked missions - The Elder Scrolls V: Skyrim - Dragonborn Game Guide

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Skyrim: Dragonborn - Summoning Karstaag!