Originally Posted by
Tzeentch's Dark Agent
Oddly enough, I am going to throw the Salamanders hat into the ring. They are still a Legion, Vulkan did not agree with Guilliman's sorting of the Chapters and demanded that his Legion remained untouched, and it has.
They have no known Successors (though some are hinted at) and no one knows how many they are.
They also have one of the most elite 1st Companies in existance, the Fire Drakes, who are ridiculously well-trained, and have the best equipment available.
Let us also not forget the Artifacts of Vulkan, one of which is a SPACE LASER.
Speaking of equipment, lots of master crafted items, the finest forged weapons known to the Imperium.
Influence, these guys have tonnes of it, due to their humanitarian ways, they are famous for saving lives, and the Imperium loves them for it.