[Suzerain of Sheol]

Originally Posted by dictionary.com

a·poth·e·o·sis   [uh-poth-ee-oh-sis, ap-uh-thee-uh-sis] Show IPA
noun, plural -ses  [-seez, -seez] Show IPA.
1.
the elevation or exaltation of a person to the rank of a god.
2.
the ideal example; epitome; quintessence: This poem is the apotheosis of lyric expression.
Origin:
1570–80; < Late Latin < Greek. See apo-, theo-, -osis

Ra and his son Horus eventually become a singular being (more through the way the stories changed over time, not so much like doing the Fusion Dance. :p)

Perhaps "supra-apotheotic" would have been more precise, since they'e both already gods.

Edit: Also, don't mind me so much, I like to make up words. ;)