Ah, I see! You are "the Worm"; a large worm-like creature that roams the natural areas of the underground and the garden areas. Your "mistress", the Gardener, feeds you with disobedient newcomers who dare try and destroy her plants, and you enjoy making sure their final moments are pleasurable. Any that you catch underground in your, for lack of a better term, "Hole", though, they have quite a different experience.
I won't keep you any longer. Who knows when someone new may arrive?