Hear me, oh Dowager of Legend
'Tis to honor Thee I call
Long haveth Thou roamed, far Thine name hast spread
Treasure and Wisdom unto Thee bequeathed - Has heaps of items/treasure
Thine completed aspect drifting twixt Terra and Firmament - Has magic to transform into a pegasus
Did naught to reveal thine obscure visage - Personality ref
I extol Thee, so bewail me not
'tis but subsidy I seek
Midnight and Moonlight, alloyed empress - possible legendary title reference: Telperion was the silver/darkness tree and Laurelin (female tree; possible empress tie) the light/gold in Tolkien lore
a Unique something to remember Thee by,
oh Venerable Sovereign of yore - King of the Basin