The final campaign – “Even Angels Cry” [7th campaign – 1st mission].

Hello everyone, I've encountered a problem: in Tears of the Phoenix, I only have Irina (Haven) available, but she starts the mission without any artifacts and at level 1. Is there any way to fix this? The mission turned out to be extremely difficult, almost impossible: I managed to defeat the first human hero purely by chance, and then with great difficulty, I gradually captured cities and fortresses (the last save date is the 25th month). Screenshots are attached - http://puu.sh/6It5h.jpg, http://puu.sh/6It67.jpg. I don't know if it's worth continuing and skipping turns, or if I should train another hero in Tears of the Phoenix. By the way, the Blood campaign went perfectly for me, and I completed it at level 30.