It's an ancient dwarf (they were taller back then) whose body died is in the Fade completely randomly.
I can do crazy theories too.
Dude, how is my theory crazier than saying it's Andraste or the Divine? At least mine is grounded in established lore.
Uthenera
Uthenera (literally "long sleep" or "endless dream") is a slumber-like state which elders of the ancient elves voluntary entered when they became weary of life and memories. While their bodies would remain in the mortal realm, their spirits would cross the Veil and wander the shifting paths of the Beyond, accompanied by two children of Mythal - Falon'Din and his twin brother Dirthamen This state did not necessarily equal death, as some would return after centuries of sleep and share the secrets of dreams with the People. Yet many would never wake up: their bodies would deteriorate and they would in fact die.
The Dalish claim that in the time of Elvhenan uthenera was viewed as an act of reverence. An elder would retire to a chamber that was one part bed and one part tomb and, to great ceremony from all the extended family, would succumb to slumber. The family would continue to visit the chamber to pay respect to the one who made such a sacrifice. The Brecilian Ruins in Ferelden and the Sundermount in the Vimmark Mountains are notable sites where elven elders came to sleep.
With the arrival of humans the practice of uthenera began to fade until it ceased forever after the fall of Arlathan.
Some elves in uthenera were able to reach "perfection" and draw sustenence from the Fade rather than dying in their sleep. It is possible that some still live, and retain some amount of control over the world of dreams. Elves in uthenera were tended by servants to prevent discomfort from waking them, and who bathed them in scented oils to provide them the spark of wisdom on their journey. Sacred herbs were thrown onto a "eternal fire" in the sleeping chambers (also sometimes doubling as burial chambers) of the Dreamers to guide them to the Beyond.
An elf who had perfected themselves no longer required the potion of water, honey and herbs used to keep mages alive during uthenera (this was determined by brushing the potion on the lips at the full moon and determining at the new moon if it had been imbibed or not). Such elves were moved into beds of pure white, signifying their achievement.