I like the idea of them being born a Fallen Aasimar. Maybe with horns or some other tiefling trait?
In my setting any child born with a tiefling parent is a tiefling regardless, but aasimar are sterile and cannot reproduce.
https://www.reddit.com/r/UnearthedArcana/comments/5m04vw/the_erlking/
https://brynvalk.wordpress.com/2015/06/09/monsters-of-dnd-the-archfey/
I tried embedding them with enworld's url tool. Hopefully that worked? If not I can try something else?
Those might have ideas on abilities, but beyond...
I have a few stat blocks and info pieces for a generic Archfey (a little low in HP, but some cool stuff) [https://brynvalk.wordpress.com/2015/06/09/monsters-of-dnd-the-archfey/], and another for the Erlkonig (Archfey for the Wild Hunt, I believe)...
Do you have a timeline/list of when some of the currently not posted epic threats will be put up? I know they're probably done in order of your interested in them, but I was hoping that maybe some of they fey will get to appear? They're a pretty neglected type of enemy in D&D imo, but I've got...