What damage does Legacy of Nightmares work with?

For those who don't know, the Legacy of Nightmare is a ring set that boosts damage by 100%, and reduces damage taken by 4%, for every piece of ancient legendary item equipped. _{Patch 2.4.1 at time of writing}

With all ancient gear (helm, chest, belt, legs, shoulders, bracers, gloves, boots, ammy, 2 rings, and both weapon slots) this can add up to 1300% damage and 52% damage reduction.

My question is: Does this damage boost apply to all sources of damage? The character, his pets and follower, item procs such as Odyn Son or Fire Walkers all the legendary gem procs, thorns, bleed, damage gained from items such as Soul Smasher and Death's Bargain, etc? Any special exceptions?

I'm hoping for a list of things it will (or won't, if that is easier) work with but any information is helpful.