Time for demigod prodution, mortal

Into the Abyss I fall, the Eye of Horus…

Rainbow Dash, meet your mother. Celestia, meet your daughter…
 
“Why do I feel so alone? I…hate being alone.”  
“No. Nonononononon. I can’t be trapped inside this gorge forever. That’s like as long as…FOREVER! SOMEPONY! ANYPONY! HELP MEEE!”
 
….meet your daughter’s abandonment issues and isolation-induced panic attacks. Great &%@#ing job there Egyption Celestia. All you gave her is her demigod level power and stubbornness, as well as the Aura of Harmony that radiates from her every move since she got her cutie mark of the greek gods.

O you young creature, so vital and young and naïve! Come away now and give of thy strength that Celestihotep, Favoured of Laur-en, might reign eternal in the lands of the twin sisters!
 
_{Oh yes. Come to mummy.}

I’m your mother, and Rarity is your sister

I see that design around an eye, and I can only think of Death of the Endless.

… I’m seeing White Glint’s marking.