Last time ended with a chest still waiting to be opened. This one opens on a chest in the stone rooms of Castle Gray Skull, with the deaths sidebar at Scoti_Garbidis 33 and BasketMC 31.
Potions and powder
The first chest holds bones, cobwebs, melon, a sword, pants and a Potion of Vulnerability: Weakness III and Resistance for 35 seconds, "-1.5 Attack Damage" when applied, and "A potion that weakens enemies and drastically lowers their resistance." One of them says, "I'm gonna take those potions and this healing potion."
A second chest is more interesting. Next to an emerald sits Blaze Powder with a tooltip that reads "This item is required in order to get to the next area." That clears something up: "So, we needed both the slime and that blaze thing and probably something else somewhere else." One of them points out, "Those are the two ingredients for magma cream." Nobody is sure what the third piece is yet.
Back to the lake
They decide not to clear the castle's bottom floor for now: "If later on we're short on emerald, then we can check it out." The haul goes back to base, with a reminder that "we still need two more emeralds." Then it's back out to the underground lake and its islands.
From the cobblestone island they look the rest over. "There's Birch, Birch Tree Island." "There's a glass thing over there," and in front of it, one of them says, "There's a ghast spawner." The islands have creeper spawners too, and before long a creeper blows up right in front of Basket.
Storming the island
The plan sounds simple. "So I say we run, jump, dig in to the bottom of that thing, and then plug up the hole." "One, two, three, go!" It does not go cleanly. "This is a lot better idea on paper." A ghast drifts over the water close to the island while they work.
Chat reads "Scoti_Garbidis was blown up by Creeper," and the sidebar ticks to 34. "Wow, I have three more deaths than you." About a minute later the same line comes up again and it reads 35. Even so, the island is "a lot shorter than it was before," and soon one of them reports, "Ghast spawner's down."
After respawning there isn't much left: "a helmet, some pants, and two blocks of dirt." The dropped gear comes back in pieces: "Here's your nearly destroyed bow, some swords, some apples." Then another spawner falls: "I broke the spawner. The creeper spawner."
The third item
Between two waterfalls stands a stone pillar. "My guess is that's the third thing we need to get to the next part of the level." In a chest there is an Awkward Potion, No Effects, with the same line as the Blaze Powder: "This item is required in order to get to the next area." The guess is a recipe: "It's fire resistance. We have to make a fire resistance potion."
There's one more chest on another island, "That might be another emerald or something." That one waits. A crafting bench goes down, axes come out, and they start on the wood before calling it there for next time.
Two deaths this episode, both Scoti's, both to creepers. The sidebar goes from Scoti_Garbidis 33 and BasketMC 31 to Scoti_Garbidis 35 and BasketMC 31. The monument isn't shown and nothing is placed, so wools stay at 0 of 16 and emerald blocks at 0 of 16.