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Minotaurs, Cows, and Wyverns placed in the back stacks — 1st, 3rd, and 6th stacks respectively. Not sure how it affects things, I've only taken a Dragon Utopia once — but from experience it seems the back stacks hit less. Put the Angels and Lizards up front to be sacrificed to the Green and Red Dragons....
Now about the battle itself... as soon as I saw in the description that there were Minotaurs — immediately thought about Bless, 12-20 damage after all!!!
In the first round, the Black and Gold ones jumped on the Serpents, the Reds on the Lizards, and the Greens dealt 185 damage to the Angels... I throw everything at the Red Dragons, removing the retaliation with the Lizards — which died in the first round along with the Serpents.
In the second round, the Gold ones kill the Angel, the rest take out the Basilisks. For tactical reasons — I need to remove the retaliation with the Cows (they're now retaliating) and kill the Green Dragons — but the setup is such that I had to do this with the Gold Dragons.
Result after 2 rounds:
I have 16 Gorgons, 20 Wyverns, and 18 Minotaurs.
In the Dragon Utopia: 8 Greens, 2 Reds, 5 Blacks, 3 Golds.
In the third round, I also couldn't pile on the Green, but I killed the Gold Dragons and 1 Red.
Left: 8 Cows, 20 Wyverns, and 18 Minotaurs vs. 8 Greens, 5 Blacks, and 1 Red.
In the fourth round, I remove the retaliation from the Greens with 2 Cows and pile on with Minotaurs and Wyverns.
In the fifth round, the Minotaurs (they retaliate, and the Black Dragons hit them) but I remove the retaliation with the Wyverns — since the Minotaurs' damage relative to their health is slightly higher than the Wyverns'... in the end, what's left is what's in the screenshot.
Bless in the first round on the Minotaurs.
Bless in the second round on the Wyverns.
Bloodlust in the 3rd round on the Minotaurs, and that's it!
There's no army on the left side, just Fiona, when she was carrying the Bless scroll, brought 9 Basilisks, 17 Serpents, and 14 Lizards from the Swamp Castle. But I left 51 Gnolls with the scout hero, although maybe 51 Gnolls could have been there instead of the Lizards, Serpents, or even the Basilisks.
P.S. It was fought on the same day as the save... without extra artifacts or parameters