Zekrol is a Rakshasa working the Broken Bones Coven and was tasked with eliminating Veronica Korsch. Zekrol can polymorph into humanoids to go undetected, and avoid scrying.
He travels with two Abishais working for him that he enslaved by knowing their true name: Gr'kzeta and Utkurun.
He works for the coven following them capturing him and finding out his full true name Tehor Zekrol. Zekrol sacrificed his left thumb in exchange for limited freedom working for the coven.