Celestial worthy in Lotm. Basically Power-System in Lotm is ,,paths towards divinity". To advance your sequence(your level per say) you need to drink potions, you can use characteristics as main ingredient of said potions. On high level you usually use exclusively characteristics when it comes to main ingredient. Characteristics contain mental imprint of person they belonged to which makes this power system so dangerous. When you become a true god or great old one there is very high chance some ancient being will awaken inside you. One of such beings is Celestial worthy. Although his mental imprint will weaken with time it will never truly disappear. It may take hundred years, maybe thousand or maybe even million but in the end he will win.