Damage modifiers for damage you do not have

Grim Dawn Gameplay Discussion
1

Playing Arcanist.
Default weapon attack is Panetti’s Replicating Missile (damage type: Elemental).
Main attacks are:

  • Albrecht’s Aether Ray (damage type: Fire & Aether)
  • Trozan’s Sky Shard (damage type: Cold & Lightning)
  • Devastation (damage type: Fire & Aether)
    How does damage modifiers work for damage that I do not have?
    Do they add “0” damage?
    Or, do they add their type of damage to the damage the current attacks do?
    For example:
    Found a Ring of the Black Matriarch which adds +63% Physical, +65% Acid, +72% Internal Trauma & +55% Poisson.
    None of the attacks I use have any of these damage types.
    Does this mean that equipping this ring will yield 0% increase in damage (when I equip the ring the damage done by the above attacks does not change when I hover the mouse over the attack)?
    Or, is there an effect in attack damage (but not shown when hovering the mouse)?
2

Yes, equipping this ring will give you zero damage increase.

The only case where you get the damage is when for example a ring has flat +10 Acid Damage and you use a skill that has %Weapon Damage. Then this skill gets a percentage of that flat +10 Acid Damage.
Not that it matters when you have very low total %Acid Damage multiplier.