Where are the Lightbringers in the Sixth World?, what with the Horrors already leaking in Options

[Sparrowhawk]

As an old Earthdawn guy running an enduring Shadowrun game, I can't help but let the Fourth World bleed into the Sixth at my table. I've already sprinkled in a bit here and there, and I had an idea to possibly introduce Lightbringers, perhaps as a magical group with some particulars on which spells and metamagics initiates could select, and maybe inventing a few of both.

But, they're nowhere to be found, at least outwardly. I think it's spelled pretty plainly for those in the know with the Earthdawn esoterica that Harlequin is a Lightbringer, Aina is very likely, -H- is teaching Frosty the tradition, and I wouldn't be surprised if Ehran was as one well. Are there any others? Any inkling of a proper Lightbringer society actually coming together? The Horrors are already a serious threat in the Sixth.

Also, has anyone tried to homebrew any Lightbringer rules into their games? I'd be interested to see what others have done.