Compared to its predessor, Eternal is unrelentingly chaotic and silently, dramatically epic.
Gameplay wise, it is painstackingly well polished- demanding both extreme focus and hyper-agressive pragmatism.
You are an armada of one waging war against an unyielding army of darkness; AND IT FEELS LIKE IT.
If you ever get a 'game over' it will likely never be because of an unbalenced mechanic or a error in level design, but it'll be the result of something that 'YOU' did wrong which you can then learn from.
Be it being overly reliant on one type of weapon, running out of ammo and not using the chainsaw, losing armour and not using the flamer; the game never truly puts you into a position where if you enter with nothing you then can't proceed any further.
With it's predessors in mind, Eternal both greatly expandes on the story given life in DOOM 2016 by creating an entire entralling universe to accommodate it, but it is in itself a love letter to DOOM 1, 2 & 64.
Ultimately, Eternal feels like an biblical maelstrom, an Apocalypse and Genesis and all at once.
Upon completing the game, it in no way felt like an true ending.
It felt like a beginning.
From the point of inception back in the summer of 2018, we knew this game would solidify the return of a beloved franchise.
Now... it feels like a harbinger.
It feels like the new beginning the IDverse needed.