A Mujina is spawning in Polland. As it searches for a place to spawn, it becomes increasingly irrational and begins lossing control over its form. It also begins planning to bring subjects for the spawnlings to copy. If the characters do not chatchit in time, they could have an invasion from within. (Remember, only immature mujina can use magic, so they will not seek to immitate mages, and will avoid them if at all possible.
It is very possible that the Mujina will seek to kill Pollonius and/or Valen in order to protect itself from discovery. This might even be the first sign of the spawning! In this case, teh characters must catch the murderer and stop the spawning before they are overwhelmed by spawnling Mujina.
Notes
This scenario is a role playing mystery. It doesn't involve any large scale combat. Good maps of the acadamy and poll's tower are required, as well as a good number of NPC's (who need to be fleshed out).