DRK tanking. A little bit of pain.

[Drkdays]

It's stronger than...

All those other abilities are on DPS classes where ap strongly affects the damage output so you can't really compare it to a tank skill since the results are totally different. They might share similar potency but will never get the same results. In any case this is about saving mana for other skills, not about the skill itself. Also I said it's more lore friendly for a class that traditionally cost health to attack rather than mana. This would be a more of a union of the old method with the new. Also it does cost more than its worth to use it on cool down because there are other abilities that are more efficient to use as a tank that, while not necessarily optimizing DPS, would benefit enmity and Yes you can certainly use it as you said, especially with mana regen skills, but the point is that it'd be better for the overall condition of drk tanking if it cost health instead. All gain, no loss.