YOMAWARI: MIDNIGHT SHADOWS

Any time you hear crows cawing, try and disturb them. There is a chance for a Karasu spirit to form from one and temporarily chase after you. I only managed to get it to spawn once for me in my entire run playing, but I decided to try with the flashlight off and got it to appear. I DO NOT know if that was the means of spawning it, but it wouldn't hurt to try.