The Regret Demon is a mostly unknown entity that presents trade options that invariably lead to remorse and regret. The Regret Demon was first encountered by [[Cristina Thompson]] after it hijacked the primary forest portal to discuss a truce. [[Cristina Thompson]] had previously heard a tale of such an entity, which brought her to understand the way it operated, in that all actions or even any inaction would lead to remorse and regret, although the entity itself was bound by a very specific code, or rules.
As a form of communication interface, the Regret Demon used a human woman, described as middle-aged and wearing wire-rimmed glasses, as a puppet. It is unconfirmed whether the puppet woman was fully human, however she appeared to resist being recaptured by the neural tissue, and through subtle abnormalities in responses to queries communicated valuable information to [[Cristina Thompson]] without the Regret Demon extracting payment in response.