Scripts

Good evening. I'm trying to figure out combat scripts, but so far without success. I saw someone mention that there's a guide to combat scripts; could someone provide a link to it? I haven't been able to find it. Is it possible for someone to help me create a necessary script? If it's feasible, of course. The idea is this: when a battle starts, and if the hero has the "Ashih's Blessing" skill, three archangels will appear on the battlefield.