Sorry, somehow I missed that.
A side note, this is where I feel like MW's skill list falls down a bit, but we use what we're given
Djivan must have been a bit of a storyteller for you to know anything about the Keltic Otherworld, Annwn. What he relayed was told in a half-believing manner without any authority or conviction. The impression you got was that it could be a land of terror, a land of the dead, a timeless paradise, and/or the abode of the gods. In other words a place of contradictions, or perhaps many things.
The one thing that stood out to you in all of the stories is that the people who supposedly went to Annwn and came back, we're all either very clever, unusually brave, or extremely virtuous -- which is to say they didn't fall prey to enchantments, they didn't give into fear, or they unlocked some secret that permitted them to pass unmolested. Conversely, the craven, the selfish, and the greedy all seem to succumb to the place and never return.