Another Fine Myth by Robert Asprin

He gestured with the brazier and slopped a bit of wine on the floor. I began to doubt his sobriety, but his voice seemed steady enough as he continued.

“I thought he had given the thing up after his last drubbing. We even gave him a few souvenirs to be sure he didn’t forget. Then this thing pops up. If he’s hiring cross-dimension help and arming them with advance technology weapons, he’s probably trying to do it again.”

“Do what?”

“I just told you. Take over the dimensions.”

“I know, but how? I mean, how does what he does in this dimension help him rule the others?”

“Oh, that. Well, each dimension has a certain amount of power that can be channeled or converted into magik. Different dimensions have different amounts, and each dimension’s power is divided up or shared by the magicians of that dimension. If he can succeed in controlling or killing the other magicians in this dimension, he can use its entire magical energy to attack another dimension. If he succeeds in winning there, he has the power from two dimensions to attack a third, and so on. As you can see, the longer he keeps his plot moving, the stronger he gets and the harder he’ll be to stop.”

“I understand now,” I said, genuinely pleased and enthusiastic.

“Good. Then you understand why we’ve got to stop him.”

I stopped being pleased and enthusiastic.

“We? You mean us? You and me?”

“I know it’s not much of a force, kid, but like I said, it’s all we’ve got.”

“I think I’d like a little of that wine now.”

“None of that, kid. You’re in training now. You’re going to need all the practice time you can get if we’re going to stop Isstvan. Bonkers or not, he’s no slouch when it comes to magik.”