Fey came to Erdreja from Arcadia like most Elder races to help Erdreja grow, as such they took little interest in the war between the elves and so very few followed the Dark Elves into the Underdark. This makes fey uncommon, but not unheard of in the Underdark.
Fey can take any number of forms or appearances, borrowing heavily from most folk lore of fairy-folk.
Makeup Advice
Fey covers quite a wide range of looks and styles, and there is certainly no right way. It is common to see fey with markings (often called a glamour) that may be personal or denote a clan/family.
Playing Notes
Fey are an unusual addition to the Underdark, but not unheard of. Most of the fey races that are local to the Underdark, such as the Gloura, are quite insane and wouldn’t normally co-operate with the faction.
It is more common for fey from the Heartlands to have migrated to the Underdark / Tarantula Faction.