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Example: Robot, Annihilator
Weakness: vulnerable to electricity
Resist: electricity 30
Lets say that enemy got hit by a maximized electricity Dragon Breath for 12d6 = 72 dmg
1. Which will be applied first, Vulnerability or Resist element?
2. Resistances and Vulnerabilities go after or before the reflex save?
3. How much damage will it take if successfully save?
4. How much damage will it take if fail the save?
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If a monster has resistance and vulnerability to the
same kind of damage (such as fire), which effect is applied
first? And when does the saving throw come in?
Always roll a saving throw before applying any effects that
would increase or reduce the damage dealt. For example, if a
frost giant is struck by a fireball that would deal 35 points of
damage, it would roll its Reflex save, then apply its
vulnerability to fire after determining how much damage the
fireball would normally deal. If the save failed, the frost giant
would take 52 points of damage: 35 + one-half of 35 (17.5,
rounded down to 17). A successful save would mean the frost
giant suffered only 25 points of damage: one-half of 35
rounded down (17), plus one-half of 17 rounded down (8).
If the creature has both resistance and vulnerability to the
same kind of damage, apply the resistance (which reduces the
damage dealt by the effect) before applying the vulnerability
(which increases the damage taken by the creature). For
example, imagine our frost giant wore a ring of minor fire
resistance (granting resistance to fire 10). If the save failed, the
frost giant would take 37 points of fire damage: 35 (fireball) –
10 (resistance to fire 10) = 25, plus one-half of 25 (12.5,
rounded down to 12). If the save succeeded, the frost giant
would take only 10 points of damage: 17 (half damage from the
fireball, rounded down) – 10 (resistance to fire 10) = 7, plus
one-half of 7 (3.5, rounded down to 3).
As a general guideline, whenever the rules don’t stipulate
an order of operations for special effects (such as spells or
special abilities), you should apply them in the order that’s
most beneficial to the creature. In the case of damage, this
typically means applying any damage-reducing effects first,
before applying any effects that would increase damage.
It was this way in 3.5, 3.0, 2ed and 1st ed
FAQ'ing..
Did James Jacobs say always apply things is whatever fasion is most advantageous for the defender?
Because isn't that how we arrived that for incorporeal you apply 50% reduction then apply DR if they have it?
So I would say that you reduce the initial damage by 30, reducing it from 72 to 42. Then it's multiplied for vulnerability to deal 63 damage on a failed save.
On a successful save 72 is reduced to 36. Then subtract 30 to get 6. Then multiply for vulnerability to get 9.
Example: Robot, Annihilator
Weakness: vulnerable to electricity
Resist: electricity 30Lets say that enemy got hit by a maximized electricity Dragon Breath for 12d6 = 72 dmg
1. Which will be applied first, Vulnerability or Resist element?
2. Resistances and Vulnerabilities go after or before the reflex save?
3. How much damage will it take if successfully save?
4. How much damage will it take if fail the save?
Hmm With that said from Tom S (assuming thats how its done) I guess I could answer my own questions.
1. Resistance should apply first.
2. Yes. Reflex save will be rolled after the spell is cast.
3. A successful save would means 72 / 2 = 36 dmg, then apply the Resistance of 30 = 6 dmg then apply vulnerability 6 x 1.5 = 9 dmg.
4. A failed save would means that we will apply the resistance first 72 - 30 = 42, then apply vulnerability 42 x 1.5 = 63 dmg.
Hmmm quite a difference between a safe and a failed from 9 dmg to 63?
Indeed, but thats how the rules would seem to indicate it works.
It's a good time to be using Heighten Spell where applicable.