What is the nature of the creature living in the ruins of Bethmora?

Near the end of Hellboy II: The Golden Army, when the team reaches the ruins of Bethmora, Liz and Hellboy are led by some lone goblin into a chamber where they meet some other creature who lives there, depicted here:

This creature seems to be somehow all-knowing or at least knows about Liz and Hellboy's true name and fate and makes prophecies about the future (and says it waited for Hellboy for a long time). It is also able to magically heal Hellboy from the serious injury he received from Nuada, with no effort from one second to the other. All in all it seems quite observant and indifferent to the world's actual fate.

While there is no doubt that this movie is full of weird and mysterious creatures, this one with its somehow decayed yet majestic and elegant appearance and its rather strange powers and mysterious aura was kind of fascinating, especially when found at such a desolate place. So is there any further information what this creature is all about? What are its background and motives and what does it do alone in the lost ruins of Bethmora?

(If I haven't missed something and it isn't explained any further in the movie, maybe the comics on which the movie are based can shed some light on it or there is some background information from the writers of the comics/movie. But maybe it is never explained any further and it is intended to be unkown and mysterious.)