The heraldry of the Knight Protectors of the Great Kingdom are something I have a hard to not coming back to. They are part of Greyhawk lore, and have several heraldry concepts floating around already but I felt there was room for one more.
The Living Greyhawk campaign introduced a shield based on the black Cranden shield flanked by the Heironeous axe and a Hextorian arrow.
To me it was a good idea but not well balanced graphically so I have played around with the Heironean hand grasping a lightning bolt and an Hextorian gauntlet holding red arrows. This feels to me more even handed, pun intended, and better balanced.