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Found some time and tested it.
Moner's stats: 6, 4, 2, 1, expert in offense and tactics.
40 fey, 10 air elementals, 6 water elementals, 5 fire elementals, 4 earth elementals, 2 mind flayers, 2 phoenixes. It's taken down quite easily without a blessing, and the phoenixes remain.
The setup is as follows:

Round 1: minus earth - water. We take out the retaliation with fire elementals and then attack with everything. 4 phoenixes remain.
Round 2: usually takes out a mind flayer or attacks the air elementals (something like 5-7 of them). We take out the retaliation with fey and attack. 2-3 phoenixes remain.
Round 3: Phoenixes attack mind flayers or air elementals. We take out the retaliation (if there's anything left) and attack.
Features:
- except for the last round (4th/5th), our phoenixes weren't touched even once.
- about 1 out of 15 times in the first round, the phoenixes attack the mind flayers.
- morale in the second round isn't scary; both phoenixes still come out.
- if 5 phoenixes remain after the first round, nothing changes; they just kill 2 mind flayers.
So, with a standard setup and without a blessing, you can definitely try it
Moner's stats: 6, 4, 2, 1, expert in offense and tactics.
40 fey, 10 air elementals, 6 water elementals, 5 fire elementals, 4 earth elementals, 2 mind flayers, 2 phoenixes. It's taken down quite easily without a blessing, and the phoenixes remain.
The setup is as follows:

Round 1: minus earth - water. We take out the retaliation with fire elementals and then attack with everything. 4 phoenixes remain.
Round 2: usually takes out a mind flayer or attacks the air elementals (something like 5-7 of them). We take out the retaliation with fey and attack. 2-3 phoenixes remain.
Round 3: Phoenixes attack mind flayers or air elementals. We take out the retaliation (if there's anything left) and attack.
Features:
- except for the last round (4th/5th), our phoenixes weren't touched even once.
- about 1 out of 15 times in the first round, the phoenixes attack the mind flayers.
- morale in the second round isn't scary; both phoenixes still come out.
- if 5 phoenixes remain after the first round, nothing changes; they just kill 2 mind flayers.
So, with a standard setup and without a blessing, you can definitely try it

