Revlid:
Grimnir's Artifacts and temples aren't great because they're godly. They're powerful because they were made in times when magic was more accessable, even to dwarfs for rune making. Which is why a lot of the dwarfen ancestor dieties power is expressed through use of runes and guidance rather than direct contact and actions.
dedwrekka
Look - God > Mortal, yes?
Grimnir > Grimnir's Axe, yes?
Both of Grimnir's Axes (one of which is hinted to actually have Grimnir, or at least part of him, inside it) have survived the Realm of Chaos entirely unchanged, and have in fact protected their wielders from being changed as well. Grimnir is the epitome of a race that is thoroughly resistant to Chaos, and it cheapens him as a character to have him turn to Chaos. Plus, when Dwarfen Priests (not through Runes) call upon Grimnir, he answers.
Though the idea of him being a mortal follower of chaos or Hashut is more appealing to me.
dedwrekka
Huh? You lost me here. You want Hashut to be just another Daemon Prince? Be aware that he shows up even before Dwarfs and Elves met.
The only way I could accept even part of this is the following interpretation:
Grimnir goes to shut the Chaos Gates.
He fails, dies, and returns to the Hall of Ancestors.
While he was fighting in the North, a great shadow, black as the smog of industry and gritty as a desert wind came upon him. As great or greater than Be'Lakor, the first Daemon Prince, whose ascension was still decades in the making. Grimnir fought the Daemon-Shadow for days and weeks, eventually smiting it so hard it fled, bellowing, to the South.
In their battle, the Daemon-Shadow tore at him, and as he had cast aside his armour, its steel-grey claws met tough skin and blessed rune rather than armour plate. Its final act before he cast the final blow was to bite deep into his arm, where the runic tattoos sputtered and, overwhelmed, died out. As though empowered by the Ancestor's magic-thick blood, the creature glowed with a sudden, furious flame, sprouting horns of pure fire.