Urghash’s Crown

I just finished a Walkthrough of the map on Veteran difficulty (playing against the AI), and here are my thoughts: The terrain is beautifully designed; the demonic lands look very impressive, with these bridges over lava rivers, volcanoes, and lakes... I played as Deleb, thanks to her ultimate Ballista. In the first few weeks, I cleared out my entire territory. I liked that there were several paths to the Yellow Castle. Then, Player 2 also emerged from the path leading to the Haven city and attacked me, but he was defeated. However, he didn't stop harassing me. After a large battle, I was left with about 50 Demonesses, two Devils, and four upgraded Lords, and I used them to roam the entire map while Grog, hired in a tavern, fought the Yellow player. To briefly describe Grog's role, he had a job that was almost as important as Deleb's, because the Yellow player somehow found 12 Devils and attacked my castle. I had to replay the battle a couple of times to win with a few squads and then launch a counterattack. During the fight against the enemy, Grog leveled up to 22, and then I locked the poor guy in his castle. As for Deleb, the ultimate Ballista was the key to victory. I cleared almost the entire map (except for the Dungeon), sailed the seas, destroyed all the Gnome dragons, but I couldn't defeat the Pyramid. Then, I accidentally found a quest for the "Ring of Sar-Elam." After the battle with the guards, I had 3 Demonesses left, but then 30 Archdevils joined me, and I happily went to conquer the Pyramid. The battle was tough, but the Ballista won again (the Devils were blinded by the Vampires). But then I got a little confused: ------I destroyed the guards, but I couldn't enter the Pyramid. What did I do wrong?------ I had to use Grog to besiege the Yellow player's city. The battle was difficult; he played tactically, and I kept having unsuccessful attacks. In the end, I won with two upgraded Horsemen. Overall, I definitely enjoyed the map. And it's even better in Multiplayer. But I didn't quite understand what happened with the Pyramid. Please explain what I did wrong? Thank you.