Helpful trick if miss getting the Loong Scales

[chitt34]

the way you supposed to get it is to have the First Rat Prince boss slam into the wall but if he doesn't you can use the Azure Dust transformation and hit the wall with that just keep attacking the center of the wall and it will bust open

[parent child bowl]

You can also use the explody rat.

[Shamboni]

You can also use Wandering Wight and head smash your way through that wall