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Warrior, the walkthroughs for different missions changed almost with every patch. And in the last mission for Raileigh, I was afraid to take an extra step on the surface because enemies with legions of demons were lurking there. I spent almost the entire mission underground. I didn't even think about taking castles. Therefore, I don't know if version 1.5 gives astral gates for capturing a castle? In the unpatched game, even Isabel could get them. They are given to Faydaen in the last mission.
If you don't turn Godric into a super-killer and don't teach him magic, you can easily defeat him along with his angels. In my case, he was almost equal to a hero of level 34 with all the spells of light magic. That's why I had problems. But in the 6th campaign, with the appearance of Godric, all the problems were solved by themselves.