Hmm...
I googled that...I like the reference...Fafnir works too, being a norse dragon and all...
For a home planet, I was thinking they'd have formed their chapter base on a planet that very rapidly orbits 2 suns and is somewhat protected by the heat and radiation, and that there are these sort of dragon like plasma based beings that live near the suns and go to the planet to breed. Maybe that killing one would be part of becoming a full Battle Brother.