Burn Baby Burn!

The burning sands is the name of a desert 400 miles north of the forest where Abaddon was training. 

While vampires in Upyr did not have a need to fear the sunlight, there was another natural phenomenon that served to spark their ire and wariness.

The sands within this hated desert had the ability to give vampires the sensation of being roasted by the morning sun. 

While they wouldn't die since it wasn't true sunlight, the sensation of being burned right down to cinders was one that would linger with them for the rest of their lives. 

It was fairly uncommon since people tended to avoid this area, but there are a few cases where vampires fell onto the sand and lost their minds within minutes from the horrendous pain.

High in the sky, the vampire king was being trailed by all of his army and was looking at the scenery from below with an appreciative gaze.