Well, I would equip items depending on the situation. It's hard to say just like that. It's very difficult.
But if we start from scratch, with no troops, no magic, and no idea about the opponent (i.e., at the beginning of the game), then probably like this: Angel Alliance, Elixir of Life, Angel Wings, Books of Earth and Air magic, and an Earth Sphere. Seems like all slots are filled.
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