Board Thread:General Discussion/@comment-147.194.56.2-20171213001104/@comment-2001:569:70BF:9700:EDB4:9D0:B425:ECC1-20180117232458

I know right, why would anyone want to summon the hoarfrost!

You will have to scroll all the way to the bottom of the article (linked above) to read about it.

The gist is that sometimes the "missions" on the left side are telling you that you can achieve something by exploring a location with a certain anomaly - so if it's telling you that you need the hoarfrost anomaly at a certain place to recieve the object, you can use the Frosty Box to summon it.