Religious event
A storm encircled the island and the Team found themselves the prey in a Hight Hunt
When the team was investigating the disappearance of Durum, a massive storm encircled the island.
All the team had awoke with an indelible runes on their forehead, Brother Matias read the portents and declared that Malar had called a High Hunt, where the team was the prey. He reveled that the island was a personal game reserve for Malar, and that the Malari were the real representation of his divinity on the island.
With the storm was blocking both physical and planar travel off the island, meaning the team would have to best their hunters or die trying.