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Looks like the AI took a Utopian and got an Angel Alliance there.
(I didn't look at the map, but this can easily happen when playing with SOD on RoE or AB maps.)

I read the description of the Alliance, and it does seem to be the case. Before the battle, the opponent cast a prayer on the entire squad, just as it says there.
However, he probably didn't get it in a Utopian (which simply doesn't exist there), but just by searching through chests. The map is divided into four squares. Red, which is what I was playing as, starts in the upper left, where there are few chests. And the Alliance was always taken by someone from the lower right, where there are many of them.