Walkthroughs for custom maps.

Currently, I'm playing the Chinese map "The Lord of the Rings." I'm facing a problem. After killing the Eye of the Fortress, I go for the Blindness and Resurrection spells. After that, I can't figure out where to go next because I need a white key everywhere. And it's impossible to kill the heroes with Magog and Hydra, even if I use Blindness. Then, a hero with 800+ Magog appears, and Blindness doesn't work on him. What should I do?