SerArthurHeath

Surely a key thing to note is that for the likes of Shards and world-hopping Hoid, thousands of years are probably "just now". Shards are effectively immortal in terms of age and Hoid was there when they were all formed. Aon and Skai's splintering do not have to be recent by our standards to count as such for the proposed writer and recipient of the letter

Bloodsickness is probably just a term they use to describe his condition, which I assumed was epilepsy which can manifest in several different ways and certainly not just in the tonic-clonic jerks that everybody knows of. Absence seizures are also common and would be more similar to what we saw and would be dangerous on a battlefield. Anyway, if what Renarin has is a fit-based condition in any way and not a latent ability then it is almost certainly neurological in nature and thus not related to his literal blood. Transfiguring the blood would be pointless.

Hey, I'm new here. I quite like aspects of this theory, but i have. another suggested reason for why Szeth's abilities should not be purely from Cultivation. It is implied ( and I just read a couple of theories based on this) that Stormlight, sharing it's name with an alias of Honor's lead Herald/angel counterpart, is linked to Honor. He can send visions from the grave to Dalinar when there is a Highstorm. Theories suggest these storms come from where he died/lies. This is purely conjecture until we see magic we know is linked to Odium or Cultivation and how it relates to Stormlight. What we know of the old magic does not have it rely on Stormlight, so I suggest it is not linked to Honor. However, Szeth's magic certainly is so I would suggest that it is linked to Honor in some way.