It is not the reality of faeries is the issue for me, but I thought of specifically of the Irish myth of the Fairy Lover called 'Leannan Sidhe' (forgive any misspellings of Irish Gaelic). Sidhe is pronounced 'Shee' and means 'people'. A 'Leannan Sidhe' is a vampire who is attached to a human and makes them brillant and reknown. Think Dylan Thomas, or the character 'Jake' from the Star Trek Series 'Deep Space Nine'. In the episode I'm thinking of an alien entity attaches herself to him and turns him into a brilliant author.