Amko
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Banshee's Wail lowers morale and luck by -1, and initiative by -10%. With an upgraded Wail of Terror, it reduces morale by -6 (luck is still reduced by -1). For humans, you can create something similar, but in reverse: Prayer with +6 attack, +1 luck, and +10% initiative. However, I wouldn't say they would be equivalent, as humans often already have high morale due to their leadership and don't necessarily need a further boost.