The Conduct Energy free action states as a requirement:
Your last action or spell this turn had the acid, cold, electricity, fire, or sonic trait.
The Conducting rune grants a weapon etched with it the Resonant trait, granting access to Conduct Energy.
If I etched that same weapon with, say, a Corrosive rune, would it grant any Strikes made with that weapon the Acid trait?
If so, does that mean that the following sequences of events is legal, RAW?
- First action: Strike (with the acid trait)
- Free action: Conduct Energy
- Second action: Strike (with the Conducting rune now active)
If so, does this mean that the second Strike would deal x[W] + 1d6 acid damage + 1d8 acid damage, where x is the number of weapon damage dice and W the weapon damage die?
tl;dr Does having a Rune with e.g. the Cold trait on a weapon make Strikes with that weapon also inherit said trait?
My gut says yes, as this seems to be the mechanism by which magic weapons grant Strikes the Magical trait:
Ghosts and other incorporeal creatures have a high resistance to physical attacks that aren't magical (attacks that lack the magical trait).
Best Answer
No, with the latest errata and clarifications from paizo available here. In fact, this specific interaction with Conduct Energy is called out in the section for the Lost Omens Ancestry Guide that the ability comes from:
So Strikes made with rune-etched weapons don't inherit the associated elemental trait. Such Strikes are still considered magical, by this line under the Damage Types section:
Interestingly, the original printing of the Core Rulebook had a contrary section to this on page 451, Damage Types and Traits, quoted below. The section was removed silently in the second printing.
Finally, you wouldn't deal quite that much damage in any case. As @WeirdFrog mentioned, conducting weapons only deal an additional 1d8, not xd8 as you've suggested.