The Flame of Udun is of course the Balrog. Balrogs are maiar of fire seduced by Melkor in the beginning of Arda, they dwelt in Utumno, the first fortress of Melkor. Udun is the Sindarin name of Utumno.
Anor is the Sindarin name of the Sun.
The Flame of Anor is the light of the sun. The sun is the fiery fruit of Laurelin, one of the Two Trees.
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