Sneak Attack and Vulnerability

[AncientSpark]

From what I understand, Sneak Attack usually is not affected by multiplicative effects. For example, you can't Empower or Maximize the Sneak Attack dice occurring on a spell.

But if the target is Vulnerable to your Sneak Attack damage type? For example, the Shaman Flame Curses a target, then the Arcane Trickster Scorching Ray's it and triggers the Sneak Attack? The Sneak Attack damage becomes fire due to it triggering off a fire spell and, thus, the target is vulnerable to the Sneak Attack damage. Is the Sneak Attack damage multiplied then or not?

[Claxon]

So sneak attack deals the same type of damage as the method that delivered it (generally speaking). In this case the sneak attack would be fire damage, which would be affected by flame curse and cause them to take the extra damage. But only because it's fire damage, normally sneak attack wouldn't get multiplied as you noted.