He can appear as anyone. He can vanish into a crowd, changing his face in the process. He uses his skills to gather information, sow rumors, and bluff his way into off-limits areas. He is the masque, the master of disguise.
Masters of Disguise is a printer-friendly PDF featuring the masque, a new 20-level base class whose talents with disguise cross over into the supernatural. This PDF also includes these crunchy items:
Favored class options for the masque
The Disguise subdomain
New rogue talents
Expanded uses for Diplomacy, Disguise, Linguistics, and Use Magic Device