Two witches and whiskey

Three months ago, I got a job as a bartender. But not in a regular bar, but in a guild. Yes, in a guild of mages.
I'm not a cool mage like my three hot best friends. I'm not a wizard or an alchemist, and not even a witch. I'm just a human: pouring drinks like a professional and not sticking my non-magical nose into magical affairs.
So why am I now standing in a ritual circle of black magic opposite the fairy lord? Why are three of my mage friends fighting for their lives behind me, and a wandering witch near my feet, whom I knocked out with a stolen spell? Good questions. But before answering them, I need to convince a very angry sea god not to crush me like a bug.
I'm pretty sure this wasn't in the bartender job description.