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Everything went well, and I optimized the build for the final stage: spellcasting with distraction, education with +2 spells and knowledge, summoning with a spell master, defense with a strong defense skill, and chaos with a frost aura to make the phoenix deal more damage. In the end, the stats with artifacts were: 9 attack, 16 defense, 36 spells, and 18 knowledge. In the final battle, I won by using the frost aura on a unit and letting the phoenix finish them off. I completed the game with this hero without any major problems. It was a bit difficult at the beginning, but the phoenix solved all the problems.