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Originally Posted by Plane
I don't really like that though... isn't the whole reason fire creatures have Vulnerability x 2 from water attacks so that -100 +100% = taking damage from normally undamaging things?
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No. Vulnerability doesn't negate (or offset) No Wounding. The order of operations here is you roll for damage, see how much penetrates, and apply the relevant Wounding Modifier(s) as multipliers, not as percentage additions. So, if 5 points penetrate DR, you multiply by 0 for No Wounding and by 2 for Vulnerability x2, for at total of 0 wounding (any real number - and a lot of imaginary ones - multiplied by 0 is 0). Note if, instead of No Wounding on the attack, the target had overlapping Vulnerability and IT:DR, it's still a multiplier - if all crushing injury is reduced to 1/3rd due to the latter, and all water damage is doubled due to the former, you end up with 2/3rd (1/3*2) wounding.
For a Powers-based Water Jet to still wound fire elementals, you'd need No Wounding to have a Limitation, such as "Not against Fire Elementals." If that's -5%, then you're looking at No Wounding (Not against Fire Elementals -5%) -47.5% instead of just No Wounding -50%.
That said, some GM's might allow for caveats like that without needing to account for them points-wise. Much as it's suggested that a Water Jet Power be able to put out fires, soak things, etc, the GM is well within rights to say "Eh, it's a fire elemental, your Water Jet's "No Wounding" doesn't apply to it." He or she would then need to decide if it does normal wounding, or if the wounding is doubled (or more, depending on how the fire elemental is built) due to the Vulnerability.
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Originally Posted by Polkageist
That's probably also an argument towards water jet doing some sort of damage by referencing high-pressure water cutting tools.
But we're playing with magic!
In the other jet thread I posted a thing about alternative fire-jet options that do damage and act like magic swords.
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A "Water Sword Jet" spell could be an option, justifying itself as being like a high-pressure water cutter. It might function similarly to the basic uses of the Ensui from
Flame of Recca (and an item made with it might resemble such a weapon).