The Krasue is under a curse that makes it ever hungry and always active in the night when it goes out hunting to satisfy its gluttony, seeking blood to drink or raw flesh to devour. It may attack cattle or chicken in the darkness, drinking their blood and eating their internal organs.[15] It may also prey on pieces of cattle, such as water buffalo that have died of other causes during the night. If blood is not available the Krasue may eat feces or carrion.[16] Clothes left outside would be found soiled with blood and excrement in the morning, allegedly after she had wiped her mouth. Therefore villagers would not leave clothes hanging to dry outside during the night hours.
The Krasue also prey on pregnant women in their homes just before or after the childbirth. It hovers around the house of the pregnant woman uttering sharp cries to instil fear. It uses an elongated proboscis-like tongue[17][18] to reach the fetus or its placenta within the womb. This habit, among other unmentionable things that this spirit does, is believed to be the cause of many diseases affecting women mainly in rural areas during their pregnancy. In some cases it may catch the unborn child and use its sharp teeth to devour it. In order to protect pregnant women from becoming victims before delivery, their relatives place thorny branches around the house. This improvised thorny fence discourages the Krasue from coming to suck the blood and causing other suffering to the pregnant lady within the house.[19] After delivery, the woman's relatives must take the cut placenta far away for burial to hide it from the Krasue. There is the belief that if the placenta is buried deep enough the spirit can not find it. [16]
The Krasue hides the headless body from which it originates in a quiet place because it needs to join it before daybreak,[20] living like a normal person during the day.[21] To crush the still headless body of the krasue is fatal to the spirit. The flying head will return after hunting but rejoin with the wrong body which will lead it to suffer torment until death. If the top part of the body fails to find the lower half before daybreak it will die in terrible pain. The Krasue will also die if its intestines get cut off or if its body disappears or gets hidden by someone. Some folk beliefs hold that the creature can be destroyed by burning it. The main foes of the Krasue are mobs of angry villagers carrying torches and machetes. They may catch the Krasue and kill it or watch where she goes before dawn and destroy her body.