We have this bit from Harmony (Chapter 28):
This immediately raises these questions to me:
What is causing that Red Haze
Is it actively attacking the planet itself, Sazed/Harmony, or the people?
Is it something from outside, or something already "on" Scadrial (Trell?)
Is the "redness" just a representation created by Harmony for Wax to "see" what is going on, or is that an actual property of that power/entity, whatever it is
Harmony has no idea what the thing is, which would suggest it is not of shardic originWhen someone becomes a Vessel, they immediately become aware of pretty much anything happening on the planet's cognitive bubble
It seems quite safe to assume that a shard should be able to easily recognize another shard's influence
Had there been something opposing Adonalsium from before the shattering, would a Vessel be able to recognise that power now? What about the shard itself?
I don't recall reading about such "miasma of dread and destruction" before. Of course we haven't seen Odium's direct influence described anywhere yet so that is one possibility, but shouldn't a Vessel be able to tell if they're seeing another shard's power?
Also we have these weird spikes made from unknown metal that probably caused the "madness" of Paalm. I read a theory that they're possibly something made by Autonomy (Bavadin) since their influence would suggest exactly such an effect. Maybe these are related to the red haze?
Edit: since the Red Haze is a thing that worries Harmony, it probably is something on the power level of a shard.