So what about Goblins that are some form of bizarre magical martial artists? If based on JoJo's concept of weaponized life energy then Goblins could perhaps be a race apart from all others, supernaturally linked to a plane or dimension of life force.
Maybe they never die of old age like Tolkien's Elves. They could be walking bombs of "positive energy", anathema to the undead. Maybe they have innate healing powers.
Another thing worth considering is if non-Goblins can learn their mysterious martial arts. It could just be plain impossible, making Goblins the kung-fu race of the campaign world; it could be partially available but Humans/Elves/Dwarves/whatever lack the link to the mysterious "life-force" and must content themselves with mundane techniques; or it could be possible for anyone to learn with a healthy dose of hard work and guts.