Where: Lake Zarovich - Northern Shore - Along the Northern Shore - Cave in the north west side of zone.
What: Sometimes this cave will spawn Fledgling vampire warriors, they can chase PC's out of the cave, or be lured out of the cave. Though they have no ill effects from the sun.
Recreate: Go to the cave when it has vampire spawns in it. Aggro the vampires and lure them to the entrance of the cave and leave. The vampire mobs will chase the PC out into the sun.
Idea: Is it possible to prevent them from leaving the cave? I know making them take sun damage would be a big lift. So, if they could be stopped from pursuing, that would be easier.
I have screenshots if they are needed.