Personally i think the parshendi belong to the creations of honor, seeing that they seem to have a very strong sense of Honor.
As for cultivation, the first question to ask is not why, but if she is still alive. I think that is not definitly said and far from certain.
For instance there ist this epigraph in chapter eleven:
“Three of sixteen ruled, but now the Broken One reigns.”
This could implicate that, while originally having three shardbearers(Honnor, Odium and Cultiation), Odium has now eliminated both of the others, so that roschar now has only one.