The Keepers were created by Men'heva after the death of Duke Alhazred Elliot from the people of his House, and later from the House Galmin. They report directly to him on all matters and have essentially usurped general authority on the isle of Zul'Dare. They are Men'heva's secret police on the island, keeping it and the city of Grinwillow in proper order for their master. Kristoff Waite eliminated all the Keepers on the island when the opportunity arose.
The studies of the Strikenstar siblings revealed that the half-trolls that comprise the Keepers have their blood-bond transferred to Men'heva himself.