Yes. But, and this part is important, I want you to either tell me about them or to pass the baton to someone else, so we don't have another "half a page is people crossposting their answers to this question" situation.
Alright. So, Knights of the Blazing Sun. The Cult of Myrmidia has always been in the minority in the Empire, only really rising to prominence after they committed themselves to supporting Magnus when he went around reuniting the Empire during the Great War. Even now, Myrmidia remains primarily a war goddess to the folk of the Empire, one popular with officers and veterans.
One of the greatest sources of rising importance in popularity for the Cult of Myrmidia for the past two centuries has been the Knights of the Blazing Sun. Templars of Myrmidia, they are based in the Empire, rather than simply being another branch of the Order of the Spear, the largest Knightly Order devoted to Myrmidia in the old World, alongside the Knights of the Verdant Field, who specialize in being forest commandos and longbowmen.
Where the knights of the Blazing Sun are unique from most other knightly orders is that they gather together in the same armies only on rare occasions. More commonly, they are found traveling either alone or in small groups, wandering the lands and offering council in matters of strategy. Many a village in the depths of the Drakwald owes their survival from a Beastman raid to a Knight of the Blazing Sun having been there to lead their militia to victory.
As devotees to a Goddess of Strategy and warfare over strictly battlefield prowess, the Knights of the Blazing Sun are known to frequently experiment with new ideas and technologies, such as carrying shields with highly polished bronze skins to blind the enemy with glaring sunlight, as well as for being adept with the use of a bow on the battlefield.
Their rising popularity, along with that of the Cult of Myrmidia in southern parts of the Empire, has resulted in scorn for the Knights from many of the Empire's knightly orders devoted to more established war gods, especially from Ulricans, who point to the Knights of the Blazing Sun as a reason for their own diminished influence, as well as decrying their tactics as being dishonourable or even cowardly.