One of the few Devas in existance, Siathal is thus one of the very few people capable of understanding the language Sutak. He is vastly experiences in organizing and maintaining expeditions and archeological dig-sites, making him a prime choice to lead an expedition.
The group met Siathal first in an expedition in the Forbidding Hills. The expedition fell into an ancient trap, and was nearly destroyed. Only thanks to the group, whom defeated a shadow-monster, could the expedition survive and even make good finds.
Since then Siathal has taken to other expeditions.