Here's another Extra Map in Mobius Final Fantasy, "Sacred Tree Yggdrasil", a fodder paradise & best place to unlock Extra-skill.
Click here to enter
This map divided into 2 section, Ability Zone & Expand Zone.
1. Ability Zone
Ability Zone called fodder paradise, is place to farm fodder for certain ability cards. You can teleport anywhere to collect ability book for your ability card.
2. Expand Zone
Expand Zone is the best place to unlock Expand Skill (Extra Skill Awakening) of your ability card. Probability increased 6 times normal area & it overlaps with the effect of Mobius Day.
So make sure to good use of it, and don't worry SE will add more Ability Books later :D