Still crashed, gonna check my mods folder.
Log: https://paste.ee/p/XxI90
I found it! the source of the problem! I looked in the mods folder, and for some reason, a few mods had duplicates. They don't show up in the logs, or the mod loader, so that's weird.
Edit: I realize that I probably coulda just checked my mods folder from the start. Sorry if I wasted your time in any way. Thanks for the help though, you helped me narrow it down until I had no other choice but to comb through the game files.