I think you have cause and effect mixed up with Luria.
Luria is not the most fun because it is rich and powerful.
Luria is the most powerful because it has been the most fun and engaging realm to be in for a long sustained period of time. The internal politics and culture created a realm that people enjoyed playing in. That retained nobles and helped ensure that if the military wasn't the strongest, it was at least always competitive. Also, Luria never worried about fighting realms outside its small area. It only ever stuck to its own business so travel times (until recently) have never been an issue.
The concept of Dwilight is that you should stick to your immediate area of influence.
Only now has Luria completely conquered its own sphere, and is now dealing with the pains of being a large realm with limited battles. It also finally has a stable government which promotes a much more unified realm. While this has strengthened the realm it has also started to see noble loss now. we'll see what the end result is eventually.
