Eternals by Kieron Gillen (Eternals Vol. 5 #1-12)

Never die... never win. What’s the point of an endless battle? For millions of years, one hundred Eternals have roamed the Earth, secret protectors of humanity. Without them, humankind would be smears between the teeth of the demon-like Deviants. The Deviant/Eternal war has waged for all time, echoing in our myths and nightmares. But today, the Eternals face something new: change! Can they - or anyone on Earth - survive this discovery? An Eternal has been murdered by one of their own, and this may not be the last such killing. But Sersi’s number one suspect is... Thena?! And as the Eternals learn the truth of their existence, their society falls into chaos. Who can raise them up from the ashes? All hail Thanos, the Mad Titan - Eternal Prime!

Collecting ETERNALS (2021) #1-12, ETERNALS: THANOS RISES, ETERNALS: CELESTIA and ETERNALS: THE HERETIC.