Hey Rren, for the bug that make the sky black that occurs when Monster Garou hits you with the third attack of his ultimate: I recommend using the day/night cycle. Even if it doesn't fix the issue itself, you could wait for it to become day, then turn the option off to get a better view while fighting.
Hey. You can remove the night time bug from Monster Garou's God Slayer skill. Just hit someone with Metal bat's counter and it will be fixed. I honestly don't know if you'll see this, but next time you'll know how to fix it without rejoining the server.