Contained in Brettspiel Adventskalender 2017 for day 20
From the Rules:
Gain 1 point while you are master.
No player can use more than one neutral liveryman each against you in any resolution where you have at least one liveryman.
Rules are in English and German. The title of the tile is only given in English on the tile. The title is the only text on the tile.
For more information, visit the BGG listing.