It's a practice of magic involving communication with the dead – either by summoning their spirits as apparitions or raising them bodily – for the purpose of divination, imparting the means to foretell future events, discover hidden knowledge, to bring someone back from the dead (temporarily), or to use the dead as a weapon. Sometimes referred to as "Death Magic", the term may also sometimes be used in a more general sense to refer to black magic or witchcraft.. User can also use communicate with the deceased – either by summoning their spirit as an apparition or raising them bodily – for the purpose of fighting along side her. The dead make good soldiers. They can’t disobey orders, never surrender, and don’t stop fighting even if some of them have random body parts fall off. To be able to summon a user with a quirk Tora must know how it works/ how it activates she gets the knowledge from analyzing the person or asking them deep questions about in a way she is almost like Izuku, she takes time out of her day to ask people who have passed away or simply visit those who are sick and don't have much time left which in a way brings them joy to see a respectful teenage girl with a "blessed" quirk want to spend their final moments with when they're forgotten.