We have been bombarding the fortress steadily for four days, and have finally broken through the outer wall. Now we have a way inside, but to attempt an assault would be suicide. Our commander knows that the enemy is too strong. To slay this dragon, we must cut off its head.
Luckily, we appear to have found a dragonslayer. The commander has enlisted the help of a shinobi—a ninja—to sneak inside and kill Tokisada himself. Without leadership, they will have no direction, and our battle becomes one we may win. Assuming, of course, the ninja can actually complete his mission. I have my doubts.
The ninja must sneak inside, kill Tokisada without being seen, and then escape back into the forest. What magic he hopes to use to help him accomplish this mission I do not know, but the darkness and the cover of tonight's thunderstorm will give him at least some assistance.