I was wondering if the %of attack Damage converted to health from Revenant Constellation works on spells. So I checked the Wikia and it says that when the buff comes from a weapon it will apply on the weapon attacks, but when found on a skill it will apply on the skill damage.
So the %dmg conversion of Revenant comes from Devotion system, it is applied on both?
I need halp! 
And if it works on spells, what happens with DoT spells?
It applies to spells if they have the stat themselves or if they have % Weapon Damage. For the context here, assume any proc/active skill is a ‘spell’.
Any source of attack damage converted to health that is applied to the character (you can view this under lifesteal in the second character tab) must be applied through weapon damage. If a skill does not have weapon damage, the only way for it to apply lifesteal is if it is a part of the actual skill itself.
Lifesteal does not effect DoTs.
So if I shoot a Dreeg’s Evil Eye with Blood Burst, the x%dmg conversion to health will apply on the 16% that my skill has? (i.e if I inflict 700 dmg with that the game will count the x% and heal me by that amount?)
It will be modified by 16%, but yes.
So I will also leeching life from my regular attack? (with the amount that appears in my Damage per Hit tab?)