Walkthrough for the "Tribes of the East" expansion.

Guys, please tell me how to complete the last mission as a mage. After the second portal, Frida goes to attack the Inferno castle, but her troops are too small to win. The enemy has a numerical advantage and also has better stats: 9, 20, 22, 13. Frida has 12, 13, 7, 8. I've completed and leveled up all the heroes in each mission, but it still doesn't help.

Added after 11 hours 26 minutes
Never mind, I've completed this stupid mission.