"....Angels, like Dæmons, do not possess a soul as they are not corporeal beings. In stead, Angels have a "core" which is tied to a celestial body. In this case, stars. This means that vanquishing an Angel's form will do nothing as its core was not destroyed.
An Angel's star has special properties. For one, it will never burn out and the colour of the star corresponds to what sphere it belongs to. The star is usually clustered among its fellow sphere kin in special guarded galaxies blind to mortal mens' eyes. This renders it near impossible to snuff it out. Thus, nearly impossible to kill an Angel.
Only special sort like high ranking Dæmons and the Færie Gods have ever snuffed out an Angel's star...."
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interesting!!!!! thansk :)