The answer was
Wolete Praeparae Rescoureus Servitium
As mentioned in the puzzle's post, formatting, spacing, and capitalization doesn't matter. However, spelling does!
My apologies for the "create form" in the Horizonos Nieuw one. Totally not intentional, but uh. Increased difficulty?
There were two ciphers.
Horizonos Nieuw, Wolete Praeparae, and Haerring Scarlettio used the mapping:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
MKSEQOVNURCHBLPWJZGATDFXIY
Khronos Vastus, Rescoureus Servitium, and Reddium Feignus use the mapping:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
KHYVLTFQOCRNIUSGBDAWJZMXEP