[Quiet Man Cometh]

I am the shepherd and warden, standing at the gate leading to realms of archaic, confounding, and ever shifting lore where intricate rituals are prepared and cast to obtain for people that which they desire. The people that perform these rituals are mentally formidable and unstable, and I am their voice. If you would seek audience with them, you must first speak with me. If they deign to speak with you, then it is through me that you will hear about it, and I will inform you of the required merits, tithes, reagents, and personal sacrifices required for your audience to be fruitful. I am also the messenger, conveying cryptic and arcane tomes back and forth between such houses of ritual and their sequestered peers.

(Anyone care to hazard a guess?)