Crashes of the Dark Knight are more likely not due to skills, but due to animation (possibly due to slowed-down approach animation).
But there is a similar case for skills; the creature Maenad (a kind of shaman) has fear and regular poison, and it can also crash when controlled by the AI.
But there is a suspicious thing here (not only here, but in 4 places in the folder below. I fixed it and am testing now, but it still crashes):
Characters/Creatures/Neutral/H5A0
1) move.(BasicSkelAnim).xdb
2) attack00.(BasicSkelAnim).xdb