I was thinking, Dirk tells Jake that every time the Condesce tried to restore her specie, her "pet" killed them psychically. This would be Gl'bgolyb, right? But Gl'bgolyb didn't died in Alternia? How Condesce acquired another Horror Terror?

Gl’bgolyb isn’t actually a horrorterror, it’s an emissary to the horrorterrors. And apparently she bred it.