Dexterousness does not affect the yellow morale bar, it helps prevent critical hits. Also, reliability runes are awesome because they are infallibility and dexterousness in the same rune.
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sillies, try comparing power difference and your crit rate (ignore crit chances/rating). Also the "miss" comes into play
In other words, its unrelated, you crit if you need to (considering the power) in order to satisfy the result