It all depends. It's also not totally fallout-canon, at least now.
Which Is why I was asking what you were adding, or had planned.
You can't make stuff like "bringing feral ghouls" etc. at all.
Sorry, I do not really know the limits of dwarf fortress. So some thoughts may be to far out. I apologize in advance...Could they bring feral ghouls/Glowing ones as a trade item in cages? Having them in a pit with prisoners would be a fun idea.
maybe slightly changed from constantly eating psychotropic sap and Bob-fruit is an idea.
Due to eating the fruits of the ghouls inflicted with this special virus, they soon become treelike as well, becoming wooden, and vengeful in the name of nature! Their leaders would be immobile, but have powerful spitting attacks (acidic/poisnous). And if you so much as harm the enviroment in a painful way, begin attacking.
They will take weaponry from any race that they attack and use them against them thus not just being strong defensivly due to their wooden enhanced bodies, but strong offensively at times, and thus being much more painful then elves wooden weaponry.
(Reference, getting splashed by a bit of Harolds blood turns your skin wooden like, thus longtime consumption of fruits/saps could cause it as well if not worse)
Question, is there actual raiders as a civ? I've only seen super mutant ambushes thus far in several world creations.