User blog comment:FairyRaven/Fairy Tail Chapter 346: Retrogression Magic, Review and Commentary/@comment-5426822-20130802152914/@comment-7418318-20130802154839

Why do you consider ouroboros as a sign for evil?

They are usualy a symbol for rebirth (just like the phoenix or the Rod of Asclepius) and/or eternity.

I also theorized that it might be phoenix grave earlier in this blog. It could also privode an alternate explenation why Flare is there.

With the Phoenix being associated with eternity and flames I wouldn't be at all surprised if that guild would hold the eternal flame in high regard. Maybe new members are required to make a kind of pilgrimage to the eternal flame, which would explain why Flare turned up at the place and why she's alone.