Silverhair Knights

The Silverhair Knights were an order of clerics of the goddess Eilistraee, completely dedicated to the redemption and subsequent protection of drow followers of Lolth, Vhaeraun and other deities of the Dark Seldarine. They fully embraced the teaching of Eilistraee about showing mercy and compassion, and fought these dark elves only by non-lethal means, hoping to make them understand the error of their ways and choose a different life.

Beliefs
Silverhair Knights vowed to never willingly kill any drow. They believed that showing the other drow the strength that can be found in compassion, showing them that living in peace, without fearing every single istant for their lives was a concrete possibility (in short, showing them the existence that the Dark Maiden wished for them), could lead them to choose to abandon the teachings of Lolth and cleave to Eilistraee.

Only when the death of a drow would directly result in saving the life of others was lethal force permitted, and even then, a silverhair knight had to atone for her act (usually through a quest for the church of Eilistraee). For the same reason, priestesses who had willingly caused the death of a drow in their past, had to seek atonement by another cleric of the goddess in order to join the order.

Activities
The Silverhair Knights were most active in regions where drow attempted to establish a foothold on the surface, mostly in Cormanthor. When they found an encampment or settlement of drow, their duty was to observe the group from afar, learning about them and identifying those who could be turned from Lolth's ways. Eventually, they would infiltrate the group, approach possible converts, and organize their escape to a safe location. Generally, silverhair knights weren't active near cities or other large metropolitan areas unless they had to escort drow converts to a sancturay within.

Composition
Silverhair Knights were mostly drow and half-drow priestesses of Eilistraee (sometimes rangers), but they could be of any race or gender.

Abilities
The Silverhair knights had a wide array of tools dedicated to the redemption of the drow and to non-lethal fighting. They were specialized in wielding their swords to incapacitate opponents rather than outright killing them (and were quite efficient with said skill) and had spells capable of incapacitating targets by various means.

For example Silverhair knights could make their opponents feel the weight of the suffering they had inflicted upon other creatures on themselves (like the awaken sins spell). They could also project bolts of moonlight capable of temporarily draining the strength and energy of their targets and paralyzing undead creatures (the moon bolt spell), or could cause a creature to become obsessed with the moon (moon lust spell), distracting them.

Silverhair Knights' voices were also blessed by Eilistraee, and had the power to soothe suspicion, pain, fear and other negative emotions, and to enhance enchantment spells. The knights could surround their body with divine energy of the goddess, becoming more graceful, faster and projecting a soft silvery light around them that could also help their sword overcome the protection from damage that some evil creatures had (Eilistraee's grace spell).

Powerful Silverhair Knights had the ability to take the full weight of cruelty and suffering inflicted by evil beings' (mostly fey, humanoids and giants) upon themselves. The target creatures were freed from such evil, but as it happened they too felt its weight on their conscience, understanding firsthand the error of their ways. This was a complex and dangerous ritual, that required the priestess to keep uninterrupted physical contact with her target (that could be willing or unwilling, usually kept bond in the latter cases). In cases of failure, the target was filled with despair and rage, while the Siverhair knight was knocked unconscious and drained of her strength, with the risk of losing her life in when confronted with particularly powerful creatures. In case of success, the target creatures regretted their past choices and chose a different path from evil.