I must have been playing too much Kingdom Of Loathing. I dreamed, earlier this week, that I was wearing a Filthy Dread Sack and it was a perfect disguise.

You're fighting a Cookie-baking Thing from Beyond Time

This is one of the primeval, endlessly malevolent, fiendishly intelligent old gods from before time and space as we know it existed. Currently, it's employed making cookies for Linnea's Crimbo takeover. I guess it's a good way to pass the time between driving mortals mad with one peek at your frightful visage.

You get the jump on it.

There's even a little picture of a stick figure with a Cthulhoid head holding a cookie