"I have the precision of the killer. I know the quickest way to immediately kill any living thing. This one's a no-brainer. Get it?"
― Devastation to Wonder Woman (DC Comics)
"We're going through the fence! Get your cars, get your guns, we're going in! Kill 'em all."
― Philip Blake/The Governor, The Walking Dead
"I want to kill everything. Whether I’m smiling, angry, crying, frustrated, in agony, or happy. Whether it be bitter or delicious. Whether it feel great or bad. Whether it be cold, hot, sweet, sour. Whether it be at night, in the morning, or in the afternoon. Whether it be a child, an adult, an old person, a baby, a man, a woman, a dog, a cat, or a wolf. I want to kill. I want to kill everything. That’s the kind of creature I am."
― Zarestia (Re:Zero)
The ability to have an intuitive knowledge of how to kill any living being. Variation of Intuitive Aptitude.
The user has innate knowledge of how to kill any living being regardless of how powerful they are. This ability comes in great significance when dealing with seemingly unstoppable opponents and allows the user to end their lives with expedient efficiency.
Nagisa Shiota (Assassination Classroom) attacks unexpectedly, he walks up to his enemy to give a paper or to look innocent and then strikes. If the weapon is explosive then he falls on the enemy, if the weapon is a knife, they fall and then go to the back of his enemy.
Esdeath (Akame ga Kill) has immense skill in killing...
...even as a child.
Light Yagami (Death Note) became so talented with the Death Note that he could orchestrate elaborate kills, and even plotted a Shinigami's demise.
The greatest assassin/hitman in the world, Duke Togo (Golgo 13) can orchestrate the most elaborate of hits to simply disposing of witnesses.
Having lived for over 5 centuries, Utsuro (Gintama) has accumulated enough experience that he claims he knows how to end any life in the world aside from his own.
It is said that Kaido, the Beast King (One Piece) will always kill his opponent in a one-on-one fight. Whether it's on the land, sea, or even the sky, he’s known as the strongest of all living things.
The Vinsmoke Family (One Piece) is a powerful family of prestigious Underworld killers with connections to the black market and advanced technology that once helped them rule the entire North Blue.