The ninth stage of the Kanigem Tournaments

Yes, regeneration is a powerful ability. I'm interested in two battles: Nightmares versus Medusas and Vampires on the bridge. Are they straightforward, or are there some tricks involved?

Nightmares versus Medusas:
Besides the Bulwark and Regenerator, two Squires and a Fairy were taken. This allowed the Nightmares to be divided into four squads. The Medusas remained as one squad.
A map with a secluded area was chosen. In the first few turns, the Nightmares stayed in place. They inflicted Terror, but the Paladins countered this magic with save-loading. Then, they moved into the secluded area. One Squire died. In the secluded area, they positioned themselves as follows: the Regenerator, Fairy, and Squire hid behind the Bulwark. Only one Nightmare squad could attack. Moreover, it could reach the Squire, but through save-loading, it was ensured that only the Bulwark was attacked. The Medusas fired at the Bulwark because it shielded everyone (they might have been able to hit the Squire, but they didn't – perhaps they didn't want to waste their attacks on a single target). Regeneration was cast on the Bulwark, and possibly some other spells like Armor and Retribution – I need to check (I can send the saves if needed). At the beginning, the Bulwark constantly pressed the Defense button until the Nightmares were reduced to two. Then, thanks to Regeneration, its health gradually increased to full, and the Nightmare died. The next Nightmare squad approached, and the cycle repeated. This was repeated three times. Then, they went to eliminate the Medusas.
Vampires on the bridge:
A difficult battle. It was only possible to divide them into three squads thanks to the Fairy; the more squads they were divided into, the easier the battle would be. The Bulwark moves forward, the Regenerator retreats to the lower right corner. The Fairy flies there as well. Three Vampire squads attack the Bulwark. It constantly presses the Defense button. Regeneration, Armor magic (and a sword and armor are also equipped on it) are cast on the Bulwark. But the Vampires only die from Retribution, and their health decreases slowly. Regeneration isn't enough, so healing is required once or twice. As soon as one Vampire dies in each squad, the need for healing disappears because Regeneration starts to cope with the health loss. And as the number of Vampires gradually decreases, things get easier :)
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That's why I want to see what path you took without Regeneration and how you managed the battles. Without it, a lot of healing will be needed, even with a staff. Where can mana be replenished? Regarding the Archer, it's clear that you provided a lot of potions with holy water. Although, ideally, it might be better to go with Holy Word magic and a staff for the fight against the undead. That is, with a different hero. I gave the Archer a Cleric with Holy Word as a backup for the fight against the undead.

P.S. Do you need additional saves for these battles? Which ones? Saves at the beginning of the battle, before the attack, so I can try it myself? Or saves from the middle of the battle?