The Girl Who Climbed the Tower is a song. While its exact nature is unknown, it may appear in the mind of any Named who develop an interest in ruling the Dread Empire of Praes. Amadeus describes it as not being from anywhere, and saying that he heard it once when he was young but "it was not for [him]". Given the title and context, it is likely about becoming the Tyrant of Praes.
Only the first and what is presumably the third verse have been revealed so far. How long the full song is and whether it has a chorus are unknown.
The first step is hardest, they said to her.
You will have to walk through fire.
It will burn away what you once were,
And always devour whole a liar
They say the third step is the cruelest,
Walk when the moon is at her clearest:
Love ends with the kiss of the knife,
Trust is the wager that takes your life
Possible Significance Edit
The description of fire burning away who the girl used to be may refer to the way that both the power of Dread Empress and the actions required to take it change the ruler. The line about devouring a liar may mean that Evil or at least the Name of Tyrant of Praes are hard on those who lie to themselves. However, this is purely speculative until more information about the song is released.
Earlier Versions Edit
An early draft of the song was posted to ErraticErrata's Tumblr feed. However, he removed that version and has requested that it not be described due to both changes since he posted that version and possible spoilers.