Why don't spells work with the life on hit spell gem?

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Mark_GGG wrote:

As Charan mentioned, you can expect the attack/spell distinction to be very explicitly clarified in-game soon (and there are plans in place to clarify the corner cases of damage types, such as detonate dead, as well - that'll take a little longer).

I hope you also explain things like "Is increased spell damage working with chaos DoT from Poison Arrow because only that increases Chaos damage from spells, well from Added Chaos damage support"

Or things like "Do Increased Minion damage passives increase bonus damage a minion would get from your Anger/Wrath aura". Since the wording of passives does not mention Physical damage one would assume it does.

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Torin wrote:

I hope you also explain things like "Is increased spell damage working with chaos DoT from Poison Arrow because only that increases Chaos damage from spells, well from Added Chaos damage support"

Poison Arrow is an attack and therefor no. Spell damage support isn't increasing the Added Chaos Damage directly, the Added Chaos Damage is being applied to the spell, and then the Spell Damage nodes are making all of those numbers on the spell XX% bigger. The reason why Elemental damage doesn't affect chaos damage is because it's not considered an Element.

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Or things like "Do Increased Minion damage passives increase bonus damage a minion would get from your Anger/Wrath aura". Since the wording of passives does not mention Physical damage one would assume it does.

The base bonus from auras are applied to each target individually, and each target's personal buffs that affect that aura are applied to them. Although I don't think Wrath would be double-dipping the bonus (because it's based off the minion's base damage, any increased minion damage already increases it from the base damage, so Wrath shouldn't be getting increased again when it's applied.)