Yep definetly Warhammer 40k vibe . Both of their views seem to be true cause the Preterhumans seem to be able controlled demons army , having demonic weapons , using arcano spell and having a technology who tap both on physical universe and immaterial universe then they are also offspring of one being beyond the conception of life and death , time and space , who is shrouded in darkness but yet hide a powerful light . Full of wisdoms teached by their parents and their siblings , they own knowledge and wisdom that the Imperial Protheans were not ready for .
By the all-encompassing light shrouded in darkness , let the truth begins to reveal to the youngs civilisation by testing them with trials and cataclysm , with sadness and joys , with peace and war , with success and error . Let them come so they would meet and knowing what their truth is , so that their end begin and the Galaxy will be released to his shackle . (I love when I wrote poetic bullshit lovecraft , it make me crazy and gain me an alignement of chaotic neutral . )