Psixxx
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The only major problem is that his initiative is 15, but if you take a staff that reduces initiative and also apply a slowing effect, he can easily defeat 80 Phoenixes (with counterattacks), although in Psi-Khan's case, breaking the first garrison was different; he seemed to be playing with a focus on Spiritual Link.
I broke through the 1st and 2nd garrisons in the same way; my army consisted of 6 stacks of Spirits, each with 1-1-1-1-1-115 units.
2 stacks fly in, but there's no room for the 3rd, so we apply a General slow and Blindness to these 2 stacks, while the 3rd stack rests. Then, we raise those Phoenixes that we managed to kill. After that, we focus on reducing the defense of the 2 Phoenix stacks so that one of the 3 Phoenix stacks can defeat these 2 stacks.
And then, Berserker, Blindness, etc.
3rd garrison.
I could have defeated it in the same way as the previous 2, but I thought I should diversify the gameplay.
Again, 2 stacks fly in, we blind them, and reduce their stats to the maximum. Then, we summon a Phoenix and apply Vampirism to it. By this time, all 3 Phoenix stacks are blinded. Then, we attack one of the blinded stacks; I don't remember exactly how many units my Phoenix defeated, but it was approximately 15, with a luck of 20+, but I'm not sure.
To speed up the game, I used Berserker on one of the Phoenix stacks. In principle, you can do the same thing without summoning a Phoenix, or with summoning one. In general, these battles with Phoenixes seemed very easy to me compared to the battle in Utopia of Dragons, where I fought for a very long time. First, I tried to break through with 20 Spirits, but I wasted 5 hours. Then, I decided to use 31 Spirits and managed to break through with difficulty, on the 8th day.