THE BROTHERS DEATH
"Everything has an end. Once you are there, so will I."
The Brothers Death. The All-Death, The Great Death, and The Small Death. The Three Lords of Death. Yulü, Yama, and Kshitigarbha
These three beings are the creators of all that which man is aware of. Darkness, light, reality, even fiction as we know it through the tree of knowledge. Through its creation, they had forged all of creation itself. One could even call them Gods of the Gods all humans worshiped once giving consciousness by their own "creators". Though, to those who are aware of them, they are merely referred to as Death and the end itself. They are the beginning as well as the end.
Death, Darkness, Knowledge, Everything.
They are the embodiments of death, of darkness, and are aware of everything that is, was, is not, was not, will be, and will not be. Through this, they can embody not just these three things, but all things. As creators, they have such authority. They are born of darkness within the nothingness of the void. Thus they embody it. They created thought, idealism, knowledge itself. Thus they can embody it. And they created death, dying, and the end itself. Thus, they embody it. All that they forged by their own existence, they can embody it.
Through this logic, this extends to all pieces of reality and fiction. Gods of religion, mythology, and even the most basic of historical sense are no exception. Even human-made media are no exception to this logic, as even man has its own interpretation of Death and concepts of the like. As the concepts themselves, they have that authority as well. They are, that they are. Known and unknown, something and nothing, they are it and more.
Sound vague? They embody that too. However, at the end all be all, they are simply known as Death.
VESSELS
Vessels. Often viewed as physical manifestations that give that which has no form and cannot create one themselves the ability to exist within the mortal plane. The Brothers Death has no such limits to their abilities, but that does not mean they cannot have a bit of fun with what they can do. With this, they can forge said vessels. They could be a regular human, or another god, or even something as simple as a house cat awaiting the next soul to pass over. Just as death is, they could, can, and will be everywhere.
Any and all vessels forged by them will either have their own story or one conjured by other humans. Overall, they simply inject themselves and those who are aware of it are simply that. Aware.