Haven – “Do not tempt the desperate” [Campaign 3, Mission 3]

Hello, colleagues! I started twice; the first time, I didn't immediately see the castle at the top, so I rode east and got beaten up by the enemy. Started a second time! Hero level 18, WIZARD (+6% Light), BLOOD. The map isn't difficult; the only decent enemy was on the island where the Sanctuary fortress is located. I killed the horses and light creatures! Too bad... There were no more problems! I captured 5 cities. As I understand it, I'm missing out on the Altars because I focused on Blood. Okay, no problem! The map isn't difficult; at least, no one killed me! The only disappointment is the "Dirge" staff. Yes, it gives -10% to the cost of Light. BUT!! DAMN! PEOPLE! The third ability, "Voice of Saphira": THINK ABOUT IT: HEALS 11 HIT POINTS! 11 HIT POINTS AND ONE CHARGE!!! I DON'T UNDERSTAND! WHAT IS THIS?! Maybe there's some trick to it??? Or is it for a Tears hero??? Please advise!!!