Perhaps because he returned every night. Perhaps because, at some forgotten point in history, someone had chosen such a nice and safe and serviceable little word out of the desperate need for simplification, and the common consensus had wisely decided not to argue into existence a more terrible one. In the end, whatever the original reason had been to define T̰́̇ͦ̀è̸̷̸̬̤̗̊_̸̵̰̦̗̒͜ȟ̗̍ͤa̶͉͉͍̭̰̅̀̈͜ͅȓ̶̶̛̦͇͙̟̈̿͒ͮ͑̋̚͡u̟͖͔̖̙͙͆̄̿ͩͧ̃̽̓̈̌̀͟͞n as a moon, the word was nothing but a misnomer.

T̰́̇ͦ̀è̸̷̸̬̤̗̊_̸̵̰̦̗̒͜ȟ̗̍ͤa̶͉͉͍̭̰̅̀̈͜ͅȓ̶̶̛̦͇͙̟̈̿͒ͮ͑̋̚͡u̟͖͔̖̙͙͆̄̿ͩͧ̃̽̓̈̌̀͟͞ possessed none of the qualities by which celestial bodies invited conceptualisation and classification. He lacked the serene surface of ςεψ, the crimson brilliance of βυγς, and even the faint promise of substance that belonged to every star. There was no visible body to him.

He was of such profound blackness that not even a midnight stalker beast like Midnight could discern any kind of structure on him. When you saw him approach, he might as well be a growing, gaping hole in the fabric of the sky, a ravenous void intruding into orbit and masquerading as celestial matter. Once his darkness touched you, even that distinction vanished. You no longer saw him at all. You no longer saw anything.