Hylas is a Familiar who was once a great man and now survives by changing masters. He later emerges after Cranaus catches Blake and Evan spying on the family, but leaves them with information they need after testing them. If that information changes events then they gain power, and the same goes if they get themselves killed because they rid their masters of spies.
He takes the form of a grey cat that looks blue in the right light.
Much like Cranaus, Hylas appears to be a wise and cunning familiar who likes to tilt the odds of things in his favor and being fair.
- Hylas was the name of a former accomplice of Hercules that was kidnapped by Water Nymphs.