The term "slaying" means to kill or murder someone or something. It can also refer to a great performance, accomplishment or victory in a particular field.
Usage examples
The dragon slaying event in the medieval fair was a thrilling spectacle.
The warrior swung his sword with precision, slaying his enemies one by one.
The superhero saved the city by slaying the villain and restoring peace.
The fierce competitor entered the gaming tournament, completely slaying his opponents in every round.
The book is an epic tale of a hero's journey, facing various challenges and slaying mythical creatures along the way.
The family of slain Member of Parliament (MP) for Abuakwa North Joseph Boakye Danquah Adu have expressed delight at the arrest of a suspect in the gruesome killing. (ghanapoliticsonline.com)
For those that like the series, I see nothing here that will keep them from enjoying countless more hours of slaying in their futures. (darkstation.com)
You generally won't be buying new equipment in this game; you'll be crafting and upgrading them using parts you carve off of slain monsters. (tomsguide.com)