What is Cain's left hand?

13 is one of the blood hallows of corpse hands.

Fierce spoon (blood spoon)-with magical energy, it is said to be the key to open the door of hell. People who can use it can cross the gap of time and enter any space different from human existence. The corpse hand-the left hand of Cain, the first blood clan, was cut off because it contained the secrets of the world. Rotten bracelets-the source of the spread of diseases and plagues. All the great plagues in history were caused by rotten bracelets (such as the Black Death), so they buried the rotten bracelets, but every time they appeared, they still caused a great plague. Puppet-Puppet is a young girl at first. After her first hug failed, an earl grafted her with a soul, so she had her own consciousness, and she could suck human blood and become a blood clan. Bone harp-the magic of sound can make bones stick to blood and make a creaking sound, which will make people weak and turn them into bone armor to protect the owner of bone harp. Blood Cup-A cup overflowing with blood can overflow the blood of a designated person. Drinking the blood in the blood cup can have the ability of a hematologist for a period of time. Wand-originally an elf's water wand, it has the ability to restore. After being cursed by the blood clan, it can induce the new abilities of the blood clan members and the abilities of human beings or animals. Soul ring-can control people's thoughts, is equally effective for blood clan members, and can trigger people's evil desires. Slaughterhead-It is said that this knife killed 500W people, and the soul of the person killed by the butcher attached to the knife and became the slave of the knife owner. Holding a butcher knife is equivalent to having a 500W necromancer. Punishment axe-the axe bearer can increase his strength by dozens of times, but at the same time he will bleed profusely. Magic mirror-drop blood on the mirror to see the past of the blood Lord. The light reflected by the mirror can affect people and blood families. Light itself is very destructive. It's the shield of the owner of the mirror. The light of the ghost lamp can make people hallucinate and control people's behavior. Poison bottle-dropping blood into the bottle will alienate the blood in the bottle. Drinking the alienated blood in the bottle can make the human, beast or blood clan mutate into a monster of terror and violence, and its ability will increase dramatically.