The heroes have done a good job with the package they delivered last time. They are now real members of the Planar Task Force. They are asked to spend time in a special room from which they can be summoned.
Soon they find themselves in the middle of a castle under siege. Goblin troops have just broken through one of the walls and are storming the castle, inhabited by Pandas. After a long battle, they are thanked for their services and returned to the Planes without being able to pick up any of the spoils of war.
Luckily the adventurers get rewards from Sir Galthor