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So, Tunar, level 5, with a 5-2-2-1 build, and a blessing in his inventory.
Army: 80 pixies, 15 air elementals, 15 water elementals, 5 fire elementals, 5 earth elementals, and 2 psychics (selected exactly according to the requirements).
In the second attempt, 10 air elementals and 14 water elementals survived, and the result was even better.
In the previous attempt (where 9 water elementals remained), the morale of the phoenixes dropped in the 2nd round, so there were more losses. In this attempt, the morale dropped late and it didn't matter anymore.
Photo report (the battle is simple, so only the starting and final screenshots):