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Darth Sidious, you can trust the inscriptions in version 1.0. Especially if you haven't installed any patches. I also didn't reach the development limit in this mission when I played it with a hero. On the first turn, I took a safe position so that I wouldn't be attacked. I guessed it on the 2nd try. On the second turn, I took a spot near the well. Therefore, the enemy had almost no mana.
The fact that I didn't reach the development limit in this mission isn't a big deal, because in the next mission, there will be an opportunity to reach the development limit for both heroes. Both of them need to be leveled up as much as possible and taught all the high-level spells (there's a treasure trove of mages and a utopia of dragons), because the 3rd mission isn't very easy even in version 1.0. In version 1.5, it was made much more difficult. My Railag and Shadia learned all the chaos spells, and Shadia also learned the darkness spells.
The fact that I didn't reach the development limit in this mission isn't a big deal, because in the next mission, there will be an opportunity to reach the development limit for both heroes. Both of them need to be leveled up as much as possible and taught all the high-level spells (there's a treasure trove of mages and a utopia of dragons), because the 3rd mission isn't very easy even in version 1.0. In version 1.5, it was made much more difficult. My Railag and Shadia learned all the chaos spells, and Shadia also learned the darkness spells.