The counter reads 72 for Scoti and 71 for Basket going in. Before anything else, there's an emerald count. "Four emeralds." "We only need one more to get another block though." "Two more." "The emerald confusion continues."
The way into the new level is a very deep hole. At the bottom there's a charged creeper spawner behind the water, and a green item that gives health boost, regeneration and a strong jump boost, so they can get back up.
The great winter
Then it's story time. One of them reads it out: this valley was once a hot place ruled by a demon. When the demon disappeared, so did the heat, and now the valley is so cold that only a few well-adapted creatures survive. Legend says the demon will come back one day to melt the ice and end the great winter. "So special ice creatures." "That's BasketMC on ice."
At first the mobs look regular, though they keep in mind there could be void below. Somebody is throwing snowballs, and archers in special armor show up near a frozen lake.
The frozen lake
Breaking the ice turns it into water, so the lake needs care. "If you see ice just by itself, that might be where the spawner is." A chest gives iron boots, a strength potion, a slowness potion and a book. Charged creepers come out, and one of them ends up "down in that watery hole," where another chest has a magic gold sword, a chainmail chestplate and arctic boots that are "just pretty normal."
Up the icefall there are bow guys and a lot of iron. "We can get a beacon, man."
Slowing spiders
Next come poison spiders and webs. Just being near the spiders makes them "super slow," and something keeps messing with the view. With a charged creeper close by, one of them says, "I'm gonna die," then gets into a hole to heal up. "Trying to avoid the deaths, man." "Yeah, I've been doing good." "Yeah, jinxed."
They take out the spawners, break some glass to get at a chest and find the item the level wants: a Summoning Scroll, "used to summon the great demon Yaaros." "This item is required in order to complete this area."
The Frozen Crown
There's "a legendary item over here," but charged creeper spawners in the ceiling come first. Then: "Frozen crown." It's a diamond helmet with Protection III, Unbreaking III and +1 attack, and it slows any enemy that gets close. "All of the ancient northern kings have worn this crown." Scoti puts it on. An enderman keeps turning up too, so: "Endermen spawner, note to self."
One more cave
A room with furnaces has a chest with an Arctic Helmet in it, plus some knockback pants and an axe with Sharpness VII. Up a ladder there are skeletons, a witch and more charged creepers, and one of them gets knocked off the edge. It's a natural place to stop, but "let's poke the bear."
The next cave has more creepers, angry endermen and spider spawners in the ceiling. They take the spawners out, gather more scrolls and peek at a wall up top. Then they head back to "our safety chest."
Nobody dies, so the counter still reads 72 and 71. The monument isn't shown, so it stays at 11 of 16 crystals and 7 of 12 emerald blocks.