Not sure how this would fly with Cappy light damage buffs. It could make light damage more useful and it's current state.
On the other hand I think a "buff upon crit/dev" is a good direction for this legendary. Currently most well geared hunters crit ~22-30% of the time and exploiting this would be beneficial. Possibly a 'bypass % armor upon crit' or a stackable (with bow chants) mitigations debuff. Say we crit the first time and it's -2% mits, then crit again -4% up to maybe 15-20%. Of course this debuff is time limited. The more we crit in a given time the higher % debuff of mits or even incoming damage. This would also encourage the stacking of fate to crit cap. If we are unlucky and no crits, the the debuff drops and we start over stacking again.
The other hand would be a HoT buff. A small return on morale would help our survivability drastically. A crit/dev gated such as agile rejoiners parry gated mechanism would be great. Think about each well geared hunter might crit/dev about 15-20 times in 60 seconds (haven't parsed in a while, not sure of exact numbers). If each crit returned 60 morale, and each dev returned 100 morale we would have a return of 900-1500 morale each minute. This isn't a lot and I think that's why it can work. If this got very generous, which it's a LEGENDARY skill it should, could stack 2x and return a bit more morale. This could be spaced out with ticks of morale regen again similar to agile rejoiner. We could tweak the numbers of course but this could help.
~Anaxander R9 Warden, Baranthor R5 Hunter, Skartan R2 Guardian~ Elendilmir
~Karukh R10 Warg, Prisonshank R6 Reaver~ Elendilmir