The Deacon is an alien that didn't get much screen time in Prometheus, but when I took a look at explaining them, there was alot to delve into. Is it a proto xenomorph? Does it fit into the xenomorph family tree at all? There is a ton of extra information on these aliens in the Dark Horse Fire and Stone comics, so we'll go there too for a look at their expanded universe history. The Deacon alien explained!

Music:

CO.AG Music
Ambient Music - The New Planet
   • Ambient Music - The New Planet  
Ambient Space Music - Nibiru
   • Ambient Space Music - Nibiru  

Epic Blast Radius
Background Music Royalty Free 11 Minutes (Atmosphere)
   • Background Music Royalty Free 11 Minu...  

TeknoAXE's Royalty Free Music
Waypoint M - Downtempo/Suspense - Royalty Free Music
   • Waypoint M - Downtempo/Suspense - Roy...  
Waypoint D -- Suspense/Action/Background -- Royalty Free Music
   • Waypoint D -- Suspense/Action/Backgro...