The trouble, of course, is the caldera. Between the recent religious disagreements and the rapid changes in leadership, the greenskins have fragmented into a dozen or more separate groups, and those that held the Citadel will allow none of the others to approach. That can not be counted on to continue when battle begins, so to prevent the battle turning to a meat grinder, something must be done to prevent reinforcements from the caldera. With your achievements so far, every head turns to you to suggest a way to accomplish this.