(Source: Brut, by Layamon)
Here's that passage where Arthur is born and then supercharged with magic by the elves (fairies), like a fantasy super soldier. It includes longevity, superhuman strength and the most OP ability of all, being rich forever. So if you had any doubts that Arthur had his own supernatural aura, there you go.
We also see Anna (Morgause) being referred to as "the blessed lady", implying she also has something magical going on. Kinda interesting to think about, considering modern stories love to jump on sorceress angle for her.
Oooh fascinating!
This element also bears notable similarity to motif of fairies attending child's birth and bestowing blessings and qualities upon it, that is most common in French literary fairy tales. The most famous example is, of course, Sleeping Beauty, but there are many others: Riquet-with-Tuft; White Doe, Princess Mayblossom....
And this motif, while rare, isn't unknown in Arthuriana, or at least, Arthuriana adjacent legends:
In Adam de la Halle's 13th century text Jeu de la feuillée, Morgan alongside two other fairies visits a human city to bestow blessings and curses to the people
In 13th century text Les Prouesses et faitz du noble Huon de Bordeaux, fairy king Oberon is identified as son of Julies Caesar and Morgan le Fay, who is cursed to always be dwarfish due to a grumpy fairy who attended his christening
In 14th century romance about Ogier the Dane, titular hero is bestowed by many gifts and virtues by fairies who attend his birth; last of which is Morgan, who promises he will be her lover
It is interesting to see how some motifs, though popularized by later traditions, are much older than one might expect. Also this passage, combined with those accounts of Uther being shapeshifter, can kind of serve as inspiration to have both Uther or Igraine, or both, have supernatural ties beyond and before Arthur's birth
Indeed, and the fact the motif appears in "Jeu de la Feuillée" proves that it was a famous and popular one culturally-speaking (at least in the France of the time), because le Jeu de la Feuillée parodies it.
