Monster Familiars and their respective cards are copies of MapleStory monsters that can be summoned through the Monster Book. They can be obtained through Booster Packs in the Cash Shop or as drops by the monster they summon. The Familiars give effects and can attack when summoned, and have different ranks denoted by color on the top left corner.
Familiar ranks have been changed to line up with the same ranks used by items in JapanMS and GlobalMS. The ranks were previously named Common, Uncommon, Rare and Legendary. These ranks have been renamed Common, Rare, Epic and Unique respectively, with a new rank above them called Legendary.
The monster familiars in red do not drop from the respective monster.