I wouldn't say that Greta's experience is "limited." Before meeting Clemira, she's level 29, and with artifacts, her stats are 15, 28, 20, 44. Karlam had even less experience, considering the Secret Paths, until he had to defeat 1600 dragons while fleeing from a demon. In battle, druids further boost magic. As a result, the battle withturned out to be a walk in the park. Mentorship with Karlam is developed through magic attraction – it's a very useful skill not to ignore. And then, mentorship can be reset with the mentor to level up the Secret Keeper.
I'll think about it. Level 29 is okay, but level 30 would be more significant, as there's a very strong dragon buff at that level. On the other hand, I agree that at levels 23-27, the dragon gains three very powerful abilities, so it might be worth raising the level requirement for them. Otherwise, summoning a level 1 Necropolis dragon might be dangerous because it could get one-shot, and then it becomes too strong. Thank you for another test;) By the way, where were those 1600 dragons? It seems I forgot to remove some growth bonuses somewhere...