A Mystery of Kaak C'ker
The Mror Archives
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Keith Baker, the creator of the Eberron campaign setting, wrote a few articles on Mror dwarfs. You can view them on WOTC’s web site here:
Dwarves of the Mror Holds, Part 1
Dwarves of the Mror Holds, Part 2
Those articles have some general knowledge stuff that I think any Mror dwarf has a good chance of knowing. I don’t think there’s any major spoilers in those articles, but I wouldn’t read too many of the articles on that site if you want to save some surprises for our other Eberron campaign.