So you are saying that the Proc Dark attunement works like curse skill.
The description of the proc says: Darkness curses enemies, causing them to take damage when attacking.
Hmm there is not much info here so lets go with your theory.
Edit:
I went ahead and tested how curse works, as per my tests it isn't the reflection of damage back on the enemy.
Armor/Damage Reduction buff/Shield has no affect on how much damage is dealt to the enemy. The damage on the enemy was same everytime they striked under the affect of curse, irrespective of how much Armor I had, if I used the Arcane Shield skill or used the Damage Reduction buff elixir.
Raw Damage/Damage Passive/Damage from Pet/Damage from elixir did change (significantly) the amount of damage dealt to the enemy everytime they strike under the affect of curse.
Conclusion: Only the Damage stat(s) (Raw/%Dmg/BonusDmg) is considered for curse damage.
Personal Conclusion: Pretty useless skill for pve, Devs should buff and tune it.
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