Elf author of the Tome of Knowledge, reported to have lost his mind behind bars in Kulbak Prison.

“Choose your course, and I will prepare your body for the journey ahead.” - Backstory Codex - Bookworm (RPA-BC) 

Grandfather of Nuli Ulthano.

Other names: The Prophet, The Genius, The Poet, “The Mad Prisoner“.

Tome of Knowledge

Letters from the Wilderness

Star's Watch

The Forest Giant

“The Mad Prisoner's” diary, found in the Archives of Kulbak Prison, requires an offering for its contents to be read;

You see a rusty nail protruding from the binding and suspect the journal is a bloodbook, its true text only revealed when it drinks from a reader. - Backstory Codex - Bookworm (RPA-BC)

In Affril, Plane of Knowledge, you meet a Klynoks who seems to recognize you, ultimately revealing himself to have once been Umin;

One of the crystal-faced Klynoks approaches, and reaches out to touch your forehead. You feel a buzzing in your mind, and then a voice: “I know you. You followed the path of my writings, and now have arrived among my greatest work. They called me mad, but now you know the truth: I spent years as a researcher for the Archives, and as a reward the Klynoks let me join their number.” - Backstory Codex - Bookworm (RPA-BC)

Based on your decisions, he will punish you, grant you the knowledge you seek, or set you on a path to recording all the world's knowledge yourself.