The Sleeper's Call
A part of an Island has been engulfed by a huge anti-magic sphere that can be entered, but never left. It was a magical protection spell gone wrong, as the Barrier was meant to protect the human mines it engulfed from the advancing Orcish war machine. The Sphere turned out far bigger than anticipated, trapping its makers and a lot of wildlife within it. Hastily turned into a prison colony, three warring factions now quarrel for supremacy in this forsaken land, after an uprising has left the prisoners in total control.