Ianto makes a face that may as well be described as pained. He didn't come up with this stuff either, you know!

"Listen, I'm. Look, I'm pretty sure it inspired the Biblical threat, I mean it definitely existed before then," he says. "But I'm not an expert. I barely even knew about Abaddon myself until we ran into it first-hand. I'm not talking heaven and hell, John. I mean -- real, ancient creatures. Beings capable of existing outside of time and space, I mean. So, yes, they called it a demon when they were figuring out how to classify it. I mean. It's not like it came from space. Not everything we dealt with came from space, there were. The cannibals? And the -- fairies?"

In retrospect that one is going to need a bit of explanation too.