Master Selsia:
Scenario 1: Beleth's agent in Giran discovered part of the Giants' biotechnology that related to our race. He tried then to deliver the information to Beleth through someone in Oren.
The Ivory Tower Wizards commissioned the raid to stop that information from falling into Beleth's hands, but since his agent appeared to be a Giran high official, they could not openly attack. So they used monsters instead
"The second scenario is..."