In return for completing this quest, you will receive the Master Index, allowing the you to travel to any propylon chamber, or return to the Caldera Mages Guild from any propylon chamber. This is a quest to find the ten propylon indices. Travel north to Dagon Fel to find out more about this legendary helm.
The Adamantium Helm of Tohan is a rare and powerful artifact lost in the Sheogorad Region.
Visit Aradraen the Fletcher in Vivec's Foreign Quarter Lower Waistworks for the world famous area effect arrows exclusive to her shop. You'll find dragonfly creatures now inhabit the muck ponds along the coast. Let the gentle chorus of swamp wildlife draw you further into the mire throughout the entire swampy region of the Bitter Coast. She will give you options to tell jokes, dance the high-kick, play the drum, play the lute and sing, or juggle.
Speak with Dulnea Ralaal in Balmora, Eight Plates on the topic 'entertain the patrons'. The add-ons have never been included with any release of the game and are not included with Game of the Year Edition.
Besides the 2 main expansions, this game has 8 DLC available free from The Elder Scrolls official website: