Ri'Zakar is a khajiit warrior and head of the Blackwood Company in Leyawiin. He has traveled all over Tamriel and had brought a living Hist Tree into Cyrodill to harvest its sap.
Ri'Zakar uses the sap from a ‘tainted’ Hist Tree to get his fighters to hallucinate, increase their strength, and go berserk in fights. Races other than argonians have a low tolerance to the sap and are heavily influenced by it, eventually passing out after the effects wear off but gradually build a tolerance.
He resorts to ‘dirty’ methods and low standards to get any job done causing trouble with the Fighters Guild.