Sounds like something Garuda famously did, though... Now, obviously the Vanu Vanu aren't snakes, so I'm not sure where the Lord of Snakes would have come from for the Ixalis version of the legend... Oh wait; Waukkeon and his kind!
Lets see... According to the Ixali legend... The Lord of Snakes tried to prevent the Ixali from flying, before Garuda saved the day and feasted on his remains... We now know the Ixali originated from Azys Lla, or a similar facility, which the Vanu Vanu have some close relation to (guarding its Key and everything)... Theory; The Lord of Snakes wasn't trying to prevent the Ixali from flying, he was trying to cast them out of the clouds, the Sea of Clouds...
Arguable that would make Garuda an Elder Primal as well, unless the Garuda that battled the Lord of Snakes wasn't a Primal and we instead have a similar situation to Saint Shiva and Icehearts' Shiva.
