What I do is i make a Stagbreaker and just smack around areas in the snow biome with a frost pot on and while you smack around, you might find something that says "Too hard!"
Normally its silver, but it can be bugged obsidian.
Has done wonders for me in the past. Just build a campfire near you and do a makeshift roof cuz youre going to be there a while.
Yw.