Knightfall
World of Kulan DM
FYI, there is a power group in Arcanum of the Stars known as the Shadow Imperium. I haven't detailed much about it (other than ideas floating around in my brain). The basic idea is that there is a powerful planar empire that exists in the Plane of Shadow. It's power centers around a powerful Shadow Emperor that has nearly as much power as Emperor Mezzenbone, but that it is more clandestine in nature. While the Red Emperor knows of the Shadow Imperium, he doesn't know the true nature of it and it's power base. (If he did, he'd be more worried about it.)
There are strong connections between the Shadow Imperium and many Outlands worlds, as many worlds seek allies against the Dragon Empire wherever possible. The connection to Toril is quite strong, but very hidden. Your PCs wouldn't know about it's leaders, although if Sil is a sombra, she could have a connection to it (although likely unknowingly). The shades of Toril are a type of sombra but slightly different. Sombra on Toril are rare but not unheard of. They are often mistaken for tieflings and other planetouched races.
Some of the sombra scattered throughout the Outlands don't even really know their origins.
There are sombras in the Dragon Empire and many of them worked for the ISPD before the Red Emperor reorganized it to put drow firmly in control of that secret police force. Many sombra left the ISPD or were pushed out, if not evilly inclined. When the drow don't want to be involved in something dangerous and public, they often send in a sombra operative with questionable morals. Those sombra with good hearts tend to work for other organizations that keep the ISPD in check. Of course, there are other sombra out there who prefer to keep to the shadows and take what the universe gives them (and some things that it doesn't). Sombra traders are often infamous.
There are strong connections between the Shadow Imperium and many Outlands worlds, as many worlds seek allies against the Dragon Empire wherever possible. The connection to Toril is quite strong, but very hidden. Your PCs wouldn't know about it's leaders, although if Sil is a sombra, she could have a connection to it (although likely unknowingly). The shades of Toril are a type of sombra but slightly different. Sombra on Toril are rare but not unheard of. They are often mistaken for tieflings and other planetouched races.
Some of the sombra scattered throughout the Outlands don't even really know their origins.
There are sombras in the Dragon Empire and many of them worked for the ISPD before the Red Emperor reorganized it to put drow firmly in control of that secret police force. Many sombra left the ISPD or were pushed out, if not evilly inclined. When the drow don't want to be involved in something dangerous and public, they often send in a sombra operative with questionable morals. Those sombra with good hearts tend to work for other organizations that keep the ISPD in check. Of course, there are other sombra out there who prefer to keep to the shadows and take what the universe gives them (and some things that it doesn't). Sombra traders are often infamous.