Harpers

This clandestine network of spellcasters and spies seeks to tip the scales in favor of the innocent, the weak, and the poor within the Realms. Harper agents pride themselves on being incorruptible defenders of good, and they never hesitate to aid the oppressed. Because they prefer to work behind the scenes, they are rarely noticed as they thwart tyrants, depose rulers, and head off any growing force that is rumored to have evil intent. The Harpers has its finger on the pulse of power in the Realms and works tirelessly to even the odds for the downtrodden.
Individual Harper agents operate alone, relying on their wits and extensive information networks to gain an advantage over their enemies. They know that knowledge is power, so gathering intelligence beforehand is paramount to their success. They are well-informed and always have access to aid, magical and otherwise. Veteran members have access to secret caches of knowledge stashed all over Faerûn, along with trusted sources stationed in every major town and city.
The organization is always on the lookout for powerful items, expressly to keep them out of the hands of evildoers. To this end its agents use various guises and identities to gain access to carefully guarded secrets such as ancestral maps, buried cities, and mages’ keeps.
The bond between Harpers is strong, and their friendships are nigh unbreakable. Rarely do they operate in the open, but on rare occasions they must, because there is no other choice. When that happens, you can be sure that a fellow Harper is watching closely, ready to emerge from the shadows and help a comrade at a moment’s notice.

“A Harper is first and foremost self-reliant, for once you are autonomous then no one can tempt you into using power as a crutch. You are sovereign unto yourself.
“Therefore, a Harper’s soul must be incorruptible. Many believe themselves to be so, but power comes in many guises, and it will surely find your weakness. Of this you may be certain. Only a true Harper can pass this test and transform weakness into strength. That is why we are the hand that stops the tyrant, feeds the oppressed, and asks for nothing in return.
“We are the song for those who have no voice.”
Remallia “Remi” Haventree

Information derived from D&D Beyond - The Five Factions