Yssgaroth

From TARDIS Index File, the free Doctor Who reference.

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Yssgaroth
Appearance / Type:	Winged serpent
Also known as:
Affiliated with:
Place of origin:	unknown, another universe
Appearances:	NA: The Pit
Mentioned in:	BFA: Zagreus
Notable Individuals:

The Yssgaroth are horrible, huge, winged snakes with many eyes, but this may be illusion, since their appearance can cause hallucination. They are native to an another universe, but they want to be released into the normal universe.(NA: The Pit)

They may be one and the same as the Great Vampires (FP:The Book of the War).

The Yssgaroths and their universe were discovered by the Time Lords in one of Rassilon's early attempts to create a black hole. Instead of creating a black hole, they accidentally punched a hole through space into Yssgaroth's Universe. The Yssgaroth escaped and caused mass destruction. The Time Lords, led by Kopyion Liall a Mahajetsu, tried to stop them, leading to the thousand year Eternal War Also known as the First Great Time War). Though they were able to push the Yssgaroths back to their own universe, billions of people were killed and whole star systems were destroyed. Even then, the Yssgaroth survived and tried to get back into the normal universe. (NA: The Pit)

One of Rassilon's titles was "Conqueror of Yssgaroth". (BFA: Zagreus)