Valley of the Children
Half a day down the river from Lonanawang there is a cave which contained thirteen children, known as the children of the abyss. When the children were killed our knocked out they released armoured, highly magic resistant, greater undead shadowy figures who cast mid rank blackfires every round as a free action in addition to having multiple weapon attacks at high rank and, of course, draining lifeforce. All but one, which fled, were killed by a Low level guild party. They were allies of the spider deamon thing and interested in things to do with souls...probably eating them. Direct sunlight burned then kills them as children(2) as does hitting them alot as undead(10). Not sure about any valley full of them, these were the ones attacking travellers in the region. At the back of the cave are four natural exit tunnels leading who-knows-where. If encountered grab them as children and drag into the sunlight, it will hurt less.
Deeper within the caverns resided a giant Spider believed to have been killed by a Guild party in Winter 807.