Walkthroughs for custom maps.

To be honest, I still don't understand how removing artifacts from computers works. Is there already a theory about this?

I gave the book of water to my death knight and sent him to the last green castle (I also had to time it so that Jelu wouldn't intercept him on the way). From the castle, his unit came out and killed mine. Then he went towards Jelu, and they exchanged – he took the book of water and part of the army from his unit, and gave him the red orb in return. I don't understand how this works either.