The monster in question is a fleshdreg with the "wrath" variation.
So here's my question: what is officially an "energy" type? Can I have the fleshdreg deal positive energy damage? Negative energy? Sonic? Force?
Are there other energy types that are rare/unique? For example, is there a "wind" energy type? An eldritch energy? A psionic energy?
I don't think that it is clearly defined anywhere, but most people accept only those listed in the description of Resit Energy spell:
This abjuration grants a creature limited protection from damage of whichever one of five energy types you select: acid, cold, electricity, fire, or sonic.
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Yeah, those are the main ones - and even sonic is pushing it a bit since it's an unusual damage type that doesn't get resisted often.
In this case, as a player, I wouldn't bat an eye if the GM had it do positive and negative energy.
As a GM I would probably restrict a player to fire, cold, acid, or electricity, unless there was a good reason otherwise.
A vicious weapon appears to do untyped energy damage. It isn't clear that's the intend, though.