how do you get the castle in the clouds emblem?

[slate pumice]

how do you get the castle in the clouds emblem? i checked light .gg and its said source: last wish raid but like is it just a random pull from chests or is it a challenge item? if you know please tell me so i can get it

[main flare]

You need to complete all the encounter challenges

For actual information on how to get any emblem go to https://destinyemblemcollector.com/
Light.gg just uses the in-game descriptions which are useless 99% of the time