What more does he want? Let me see...revenge against a King (and his council) who has treated one of the most successful infiltrators on Atamara as a "bandit in the night," 2000 gold bounty, a lame-duck King off the throne of Eston, the duchy of Belegrond under the rule of Rieleston, and a really good cup of coffee. Wait, the coffee is what my brain wants this early in the morning.
I suppose at this point of his 72 year old life and 40+ year infiltrator career, Elroy's main reason for doing what he does is simple...amusement...because he can.