A hobgoblin is not a Goblin but is a hob goblin. They are unlike wizards,witches and elves as they do not have the same magic if you do not think a hobgoblin they will curse you [that is if they are evil].If you do incounter an evil hob goblin they are likely to be a gatekeeper to the forbidden realm.
You will never see an invisible hobgoblin not just because theyre invisible also because they're never able to be invisible. This is all my research fo now.
Mr a hob