Yggdrasil

Yggdrasil is the name of the city where Alec was born and raised. Matt, Hootch and Gama spent 2 days in Yggdrasil before moving on to save Amy.

Before
Yggdrasil was a city nearing the Crystal Forest. After going through the Crystal Fields and Crystal Forest, the city was just behind the location where the Painful Path is located.

Present
Yggdrasil is now located inside the Heavenly City of Pain, as Louis allowed those who were taken with the city to live there, Yggdrasil has no relation with Louis' forces, they also had to adapt to the monsters that come at night.