Fizz here, gonna give ya my opinion!
I see what your going for, but I honestly don't think this will pass. The Redlines need work, and the descriptions of the spells also need more work. I also see this overlapping with many magics already. (Deity, druidism, other dark magics). It also seems a bit confusing to me oocly, and it seems crucial information is not there. Overall, id take a step back... and ask some voidal magic users what their input is. Im not a voidal mage (yet) on any personas, so it would be wise to contact them. Good job with the lore though, I can tell you put thought and time into this. I hope to see more of your lore ideas soon!
Have a good day!