The Princess is a Digital Boss Monster Kickstarter exclusive. It will be available to play with in the video game and a physical copy will be shipped to all backers.
The card is very similary to Pixel Lincoln, except The Princess has 1 more health and allows players to draw Rooms instead of Spells, if they so wish.
When the Princess appears in town, each player may draw up to three Spell or Room cards. During the Bait Phase, the Princess is lured to the dungeon of the player with the most cards in hand.