They want the Main quest story line. The story line is attached to the will of the developer so they want it
He alreaady spoiled it bit by bit now, well wouldn't be his Friend more effiient rather than be his enemy? I mean all the resource and money instead to make him failed they can boost him to grow.
Because greed. They want a monopoly. I think the developer pulled a Willie Wonka and is using the quest to find a successor or something. They want control so they must be first. They have to delay him if not kill him so they can maintain their power
At this point they are so desperate to bring down Archmage. I don't know why they go this far just because Archmage rejecting join their guild lol. I'm not even be shocked if later on the guild is crumble.