2 minute cooldown seems a bit excessive, even with death on expiration.
indeed, 5-10m would be more appropriate but in keeping with the death-on-expiration idea it should absolutely give the reaver an unkillable state. outside of pure morale stacking to the brim the skill has been ridiculously hard to manage for years now. not that its difficulty is a bad thing, but pointless is more a word I would use instead.
There may come a time for valor without renown, for those without swords may surely still die upon them.