Archivo:Navani's Notebook - Dagger.jpg

Summary

Interior illustration from Rhythm of War, depicting a page from the in-world Rhythm of War. It includes illustrations of and notes about the daggers used by Raboniel and the Fused to harvest the souls of Heralds.

Transcript, top to bottom:

Raboniel's Soul-
Harvesting Dagger

The white gold metal vein down the middle conducts Investiture.
Raboniel calls the metal Raysium and says there is not enough in
this dagger to collect her soul or that of a Herald.
I am not sure I believe her.

Undertext:
Navani is right not to believe. I have given her few reasons to
trust me, after all, but in this thing I do not lie.
Why give into my enemy's hands the means to destroy me?

I will proceed with my experiments.
Our discovery of Warlight, paired with my eventual understanding
of this dagger might yield a way to stop this war.

Undertext:
Though I think we disagree on what an acceptable end to the war
actually looks like.

The ruby is housed in a metal other than Raysium; silver, maybe?

Undertext:
I can confirm: the metal is not Raysium but a silver-
nickel alloy and does not affect the dagger's function.

Touching the dagger to
half of the ruby does not
pull out the half spren.
Cracking one half,
however, allows the
spren to escape.
The dagger immediately
pulls the spren along the
Raysium vein and into the
gem at its base.

I suspect the vein of Raysium continues through the dagger's
hilt and somehow attaches to the ruby at its base.

Undertext:
The Raysium vein is removable, reversible, and
conducts Investiture directly to the gemstone.