Experience the Scarthan World
The Bulk of the remaining human population. They are subject to an Ulpir Lord/Lady. They live in villages, towns or slave camps with varying degrees of freedom. But they are always under the cloud of their masters.
They regularly have to sacrafice their freinds and family to slake the thirst of the Ulpir . In some places this is done by lottery. Others, the Lord or Lady come into to town and choose their consort/feast. It may happen on every full moon, or but once a season, but it is always inevitable.