Hmmm... A theme for Redcloak. Well, the obvious choice is a vaguely military minor-key march, although maybe that's a little too... Vader-y? Hints of Xykon's and Redcloak's themes and/or The Plan (I'm assuming the plan it refers to is TDO's) are probably good ideas--though it would have to be pretty original too, if it were going to get away with that.

I'll give it a shot, see what I come up with.