How to unlock the Nightingale Antiquarian card

How do you get the Nightingale Antiquarian card? In Inflexion's new open-world survival experience, there are many mechanics at play. One of those mechanics involves unlocking cards which can be used to manipulate your current environment, or transport you to a new one.
These Nightingale Realm Cards are unlocked via a series of different challenges and are dotted about randomly. Luckily, it seems that the Antiquarian card's location is fixed in the early-game. You should be able to get your hands on it within 3 hours of playing Nightingale, if not sooner, but you'll need to know where to look.
RELATED LINKS:
All Nightingale Apex Creatures and how to beat them
Best Nightingale weapons
All Nightingale bosses and how to beat them