It was a demon, one of. There's honestly too many different types of things out there, I'm never too sure if there even is a nomenclature that could be attributed. But this thing was definitely a demon. That's what the first half of the ritual does, from the Mathers' book.
What can they do to humans? All sorts of things. This is probably a better list than I can cover: https://en.wikipedia.org/wiki/List_of_demons_in_the_Ars_Goet...
Do note, some of them are rubbish... But not the ones you might think. Things like "become invisible" doesn't always mean that you turn transparent - it can be that nobody notices you.
This one, had a murderous vengeance towards the one whom imprisoned it. We just installed a vehicle lift in our hackerspace, and there was an open house that evening. It would have been catastrophic if 'somehow' that lift malfunctioned and crushed someone... And having an electrical malfunction or a hydraulic breach would be well within the power of that entity.