The 3rd stage of the annual John Van Caneghem Tournament (2007).

I, like probably all the other participants in the Tournament,
considered the option of destroying the Crystal Dragon + Zombie Dragon.

But in the end, I rejected it.
And all because I didn't know that the ammunition cart
increases the number of shots to infinity,
I used to think that it increased the shots by 12-24 units.
Now I'll definitely remember that...

I was also afraid of a battle with the Crystal Dragon on cursed land.
But, as it turned out later (I checked),
8-9 angels destroy these dragons without losses
due to the combination of spells
Expert Shield + Expert Stone Skin + Healing (not necessarily Expert).

And here, the 6-day result seems realistic to me.
RAPER is right, he messed something up with Fireball.
It would have been possible to give Desse the Pathfinding skill, visit Utopia
and eliminate the dragons (possibly capturing the green castle along the way).

In any case - to Fireball - respect! :) probably few people expected
such a fast result with the dragons being eliminated.

P.S. to VDV_forever: I sent the walkthrough description.