From the Summer 2017 Feudum: The Queen’s Army Kickstarter Campaign. The gold foil-stamped card is for use in the Feudum: The Queen's Army expansion.
This "Atticus" Royal Writ Mandate card lets you halt the horse's movement during the Queen's Move Action. Her pawns still move towards the stalled horse if possible. Return the card to the bottom of the Royal Writ deck after use.
For more information, visit the BGG listing.