Kill Spell, the name itself sounds so gruesome. It's the spell that once plagues the world. It doesn't have a frail in the slightest. Because of its enormous power, people wanted to achieve it in the past. They made a massacre. It is known that the one who possesses its power would dominate the entire world. The energy level of the spell could refer to God's level. People had exasperation towards people who gained it.
The main features of the spell are, you can control time and space. Yeah, it's like a time machine. But it didn't end there. If one wanted, one could travel to other worlds. Day by Day people uses their creativity to use the spell. Namely, If you can stop time, then in one to one battle, you could use this power to win.
Likely, A apple can stay fresh for a few days. But what if you stop the time surrounding it. Apple will never get rotten and you can eat it after a long time. Theoretically, we get to see it in war and in a vast way. It's a spell that could eradicate the entire mankind. The misuse of the spell could bring distraction. So, it shouldn't fall into evil hands. There's also a negative impact on the person who uses the spell. There's a saying, "Everything has a price to pay." This suits perfectly. The side effects can be deadly for each person to person. For example, King Henri is a person who gets to use the spell. In the morin war, he uses the spell to see the future of the war. When he came back to the present, he found out that he no longer can talk. He lost his voice for the cost of the spell. The spell uses massive amounts of magical power that are within ourselves. Every time one uses its power, he had to sacrifice something. For small use, the cost will be short, and the bigger the use the more it will cost you. It's like a curse. Not gonna lie, The Spell was sealed for ages but someone broke it at first. Then everything started. If it was never broke then there wouldn't be any war in the past. The current guild Master created the competition. A competition for the kill Spell. Only the worthy one can get the Spell. The game is as hard as you think. Participants from different worlds came to participate in the game. Jack, Robert, Max, Grimmer...etc. Each has their reasons for participating. Some came for power, some for pure fun. Not everyone can become the warrior that the Kill Spell needed. Fun fact, Kill Spell brings out your inner darkness. It projects what you don't want to project. You might be thinking why the spell is called 'Kill' Spell.
The first one to use the spell slaughtered nearly a village of people. After that people started calling the spell Kill Spell. The person who did this was a teenage boy. His wish was to kill the people living in the village that he lives in. The reason was the villagers insulted him and his mother because they are from an infamous family. After that massacre, The boy died. Because he had not enough magic energy in him. He was just a normal boy.