Something I don't quite understand: You say they "hunt and devour members of other races". Then you state that they devour their fallen foes, as a way of purifying them. So do they actively hunt other races, or is it just those that oppose them who are subject to this behaviour?
Otherwise a wonderful sub!
It is important to note, that many civilizations distinguish between a daily breakfast and a breakfast on holidays.
Different meals might also be popular in various times of the year, and certainly the poor and the rich will feast differently.
Depending on the religion in order, I would see many advocates for the destruction of this evil device (from an inquisitory point of view).
I could also imagine that access to this powerful artifact would be drastically limited.
I my gosh, this sparks so many ideas! I see at least an NPC or two, and myriads of plot hooks. I can't afford the time to write down an NPC just now, so...
The current leader of the faith and/or ruler of the land see images they interprete as themselves being dethroned be someone who may or may not be identifiable. Work in you PC group from here, as supporters or opponents. Maybe one of them can be identified as the "crown thief"?
The leaders of the church have changed, and the new, overly conservative regime wants to destroy the Clock
The neighboring land want to get hold of this item of miraculous power.