Homm5 Skill School

Thanks to everyone! The issue is basically resolved. I tried it myself on a medium-sized map with strong creatures, and it's impossible to break through to another castle on day 4 (at least with our level of skill). In mod 3.1, the path was guarded by 50 Viziers of Genies, 30 Battle Mages, and 4 Cats (Rakshasa).