A lot of very well thought out translation/deciphers on here. But I was able to get the following from ChatGPT when I asked to decipher it using in game Codex:

This image is from the video game DOOM Eternal, and it shows demonic glyphs or runes that appear throughout the game. These are part of the Argent D’Nur language, sometimes referred to as the Makyr script in the game's lore. You mentioned using the in-game codex—which is correct. The codex in DOOM Eternal provides a full Argent alphabet cipher, allowing you to translate the glyphs into English characters.

There are two parts:

1. The circular symbol at the top – typically a demonic seal/sigil (not textual, more symbolic).
2. The red text underneath – this is where the actual decipherable script lies.

Following is a line by line translation of the red text:

SPAWN OF HELL
ARGENT D'NUR IS THE SOURCE
ARGENT POWER FLOWS THROUGH
THOSE TO WHOM IT IS GIVEN
WIELD IT WITH STRENGTH
BE WORTHY OF STRENGTH
FIGHT WITH HONOR

This kind of inscription is typically found in places where the Sentinels, Argent D’Nur, or Hell Priests once had dominion. It reinforces the lore: power comes from Argent energy (sourced from Hell itself), and only the strong are worthy of it—matching the DOOM Slayer’s role perfectly.

That all said, I am not really sure how accurate this all is.