Enshrouded:
I found the snow biome. Or rather, I found some edges of it. I guess I didn't notice before because I've been using double-jump, gliding, and a lot of pickaxing to reach places before the game wants you to, I think. So I'm often in tunnels, or it's night, or ---
Anyway - I glided and then made a tunnel upwards in this one spot. I hit patches of snow and new granite/blocks (I can now build snowmen). At one flat cliff ledge some way up, I plopped a base-altar. Good thing, since about 60 more seconds of tunneling upwards through rock, I wtf dropped dead, apparently from cold. Tried again, paid more attention, saw the tiny "frost death imminent" timer bar this time. So I went sideways. Found another snowy ledge, but this one had a nice, empty, pre-built fancy stone house. So I put a base altar in there as a foothold. there was a path upwards. So I tried again, just walking. Worked for a while, then that bar showed up again and I had to rush back down. I think it's "altitude" based, not the actual snow.
Guess I need frost protection. I have zero idea how to get it. My altar stage is still only lvl 5, that's probably some of it. Each altar level (for me so far) has at least one (shroud) material required that is so annoying to get, even with 25+minute shroud-time. Either because of grind or getting lost finding a POI area or a spawn area etc. Dangit, guess I gotta grind.