Long ago before Narinder's imprisonment. Each of the Bishops of the Old Faith had a bitter rivalry with a god in the lands beyond. These other gods were admittedly stronger then their Bishop rivals. It was the Bishops' unity that kept these other gods at bay. Salvanis's rival was Shamura.
Their rivalry began before the two were even gods. Salvanis was the one who found the purple crown first. But in his hastened excited flight, he neglected to watch where he went and got caught in Shamura's web. The spider closed in, Salvanis quickly struggled free and escaped, leaving the purple crown behind in the web, to which Shamura claimed. Salvanis would later spitefully search for another crown to claim, the grey crown.
Salvanis constantly feeds on the dreams of mortals, not just getting sustenance and power, but their knowledge and secrets. Including those from the Bishops of the Old Faith's followers. Shamura didn't like Salvanis could penetrate the minds of their disciples. Salvanis couldn't stand light even when not physically being somewhere. Nightlights were sources some used to ward off Salvanis' reach, but only slightly. But hindered their ability to sleep, as darkness inspires sleep. Shamura created a better more effective alternative. They weaved their webs to make dreamcatchers, with the power to protect dreamers from Salvanis completely. With not the need for light, and having full assurance Salvanis could not feed on the minds, imagination, and knowledge of mortals. Salvanis of course didn't like it, the dreamcatchers themselves reminded him of how his rivalry with Shamura began. These two also never saw each other again after Narinder's imprisonment. Salvanis would relish knowing Shamura's knowledge and clarity slipped with their mind.
It's no coincidence each bovine bishop gets their colored copy of the red crown. The red crown couldn't originally divide itself into four copies. They are shadowed reflections of the Bishops of the Old Faith's absorbed power. Goat gets a shadowed copy of Shamura's power. An improved empowered version, making the Goat stronger with their raising faith in the Lamb. Because the crown copy carries Shamura's power, it is the perfect counter to Salvanis. The dream vampire was very displeased at the sight of Goat wearing a crown of Shamura's color.
Another reason Salvanis distastes the Goat. In relation to vampires and their reflectionless nature to mirrors. Since the Goat is a living reflection of the Lamb, Salvanis doesn't like that. Him a master of darkness, the Goat a shadow made flesh, not his to control.
The relic of Salvanis is his Ruby of Requiem. He wears on his collar. The First Dreamcatcher of Shamura can also be collected.
The reason Shamura doesn't have their bandages, is because the shadow shows them back before getting wounded. During the prime of the spider and the bat's hated rivalry.
Fun Fact: Bats have been known to get caught in spiderwebs.