It resurrects any dead monsters aside from the bosses. If you wish to prevent it, go to a shrine and stay there until after midnight. However, if you do this, it will happen the next night and so on.
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1 up, 3y
also now you just encouraged me to go play botw, see ya later B)
HAS THIS EVER HAPPENED TO ANYONE: YOU ARE WALKING AROUND AND IT ISN'T EVEN NIGHT TIME AND ALL THE SUDDEN A BLOOD MOON HAPPENS; THIS HAPPENED TO ME EARLIER WHICH IS WHY I'M ASKING