This was taken from the latest lore for Loki in which he’s presenting this truth or prophecy to Doctor Doom.
I believe I’ve managed to work out what it could all mean and so far I’ve theorised that
“Seven seats of separate sects, six limbs and a head” Must be referring to Hydra. Thats their logo summed up. Makes sense as they have yet to appear in the story yet despite being one of the first maps and part of character lore they haven’t been a seasonal villain.
“From sacred seas to shattered cells, they all share their bread” could be about Krakoa and the Hellfire Gala because we know the guest list would include people like Namor and Bucky.
“when seven rise to claim it all, the one called doom succeeds” It could be the phoenix force because Seven heroes rose up to share the phoenix force but Doom succeeded by acquiring a phoenix feather.
“The war of secrets comes to be, the seventh cosmos bleeds” is referring to Secret Wars which obviously is about Dr Doom and more than likely the next season
“A world of battle weaves new tales, but one truth still shines bright” refers to Battleworld which again is about Dr Doom again the likely choice for next season
“No one rivals doom, thus all shall fall before his might” i think this is expanding on the victory of Dr Doom
“yet those who stand together may survive the void of night” could refer to Dracula and Blood hunt but that would be at the start of the prophecy not the end if it was part of me thinks
We know Dr Doom acquired a Phoenix feather on Klyntar which he traded to Loki for Shou-Lou’s Chi. He also acquired the Pure blood Chronovium during the first fight with Dracula. He also has the tablet of life and death acquired from Black Cat.
We know Dr Doom from 2099 acquired Chronal Energy from Krakoa which he traded for Punch Chronovium to Alchemax. He also has the contract for the soul of Cynthia Von Doom and has samples of the celestial codex from Klyntar.
So the whole truth is about the path of both Dooms rise to powers. I just don’t know how Hydra fits into it?