Dragonborn - Apocrypha (Untold Legends)

 

The Black Book needed to access Untold Legends is found inside Benkongerike.

Untold Legends is an area of Hermaeus Mora's plane of Oblivion, Apocrypha. There are five zones in the area.  The realm is inhabited by Seekers and Lurkers also tentacles constantly breach the acidic dark waters and whip at you, causing a significant amount of damage if they manage to hit you. The acidic waters with the tentacles are also poisonous.

(Text mostly from the UESP WIKI with my own in game pictures)

Zone 1: Chapter I

Chapter one opens at the top of a corridor. It winds its way down past three fonts of magicka and a font of stamina to the book to chapter II. By the third font of magicka is a table with three soul gems (two random, and one leveled).

Zone 2: Chapter II

Chapter II starts north of the end of Chapter I. There are three fonts of stamina, two fonts of magicka, and a lurker along the way over the platforms to a junction. To the right are two fonts of magicka and the book to Chapter III. To the left is a font of magicka and the book to Chapter IV.

 Zone 3: Chapter III   

Chapter III is a treasure room guarded by a seeker. On the table is a pod, a random soul gem, and a copy of the Spell Tome: Conjure Seeker (but only if your Conjuration skill is at least level 40).

 

 Zone 4: Chapter IV

Chapter IV is to the south of the book to it, and there is a font of stamina either side of the entrance. There is a font of magicka halfway along the corridor that leads to a room with six alcoves, three on either side. The room is guarded by three seekers, and requires you to activate four scryes to open the next corridor.
The first alcove to the left has an apprentice-locked pod, two soul gems (black and greater), and four skill books, for four of the "stealth" skills; Advances in Lockpicking (Lockpicking), Beggar (Pickpocket), The Gold Ribbon of Merit (Archery), The Rear Guard (Light Armor). The second alcove on the left is currently inaccessible, and the third alcove only has a font of stamina.
All three alcoves on the right-hand side contain a font of magicka, and while the first and third alcoves have a pod (the one in the third room has a novice lock), the middle alcove has a scrye outside it to open the gate, and one inside to open the gate for the middle alcove on the left-hand side of the room. Inside that alcove is another scrye that opens the middle platform, and inside that is a scrye to open the gate to the corridor ahead; there are also four fonts of magicka on the platform. Just before the book to chapter V is a vessel.

Zone 5: Chapter V

There is a font of magicka behind the entrance. Halfway along the corridor are two fonts of stamina, and at the very far end of the corridor are two more, plus the black book Untold Legends. To exit this part of Apocrypha, use the non-circular part of the black book.

 

The reward is one of three secret powers on offer from the book are:

• Bardic Knowledge: Summons a spectral drum that plays for 300 seconds, improving Stamina Regen for you and nearby allies.
• Black Market: Summons a Dremora merchant
• Secret Servant: Summons a Dremora butler to carry your excess items.

I chose the Merchant option as I thought it would be best to sell off any items I could not carry anymore and so far I think it was the best choice.