Skyblock/Dungeons/Brewing
Dungeon Brewing, also called dungeon potions, is a custom feature that adds unique and powerful potions to rainyday. Each environment unlocks new types of potions. These potions grant buffs and special effects, such as increased skill attributes, higher skydust or XP drops, a chance to find crate keys from dungeon monsters, and more. Drinking more than one of the same potion extends it's timer, meaning you could get an infinite timer of a certain dungeon potion type. Only one dungeon potion type can be active at once unless you use the potion of duality that provides two random dungeon potion effects. After you use a potion of duality you can also drink the two types of dungeon potions it randomly gave you to infinitely extend the time on both effects for some useful combinations.
Check your active effects by using the command /dungeon potion
You can also clear any active dungeon potions you no longer want with the command /dungeon potion clear
Boss Brewer
Brewing dungeon potions requires a boss brewer, a custom crafted brewing stand that works with dungeon ingredients while still functioning like a regular brewing stand. Boss Brewers can be automated just like vanilla brewing stands, allowing you to produce large quantities of potions as long as you can stockpile enough ingredients. Crafting a boss brewer will complete an objective in the "Alchemy" intermediate mission.
To craft a boss brewer, you must first unlock the recipe by reaching expert in your islands coal study. The crafting recipe requires three special coal and two regular coal blocks. You can still use a boss brewer without unlocking the expert coal study if you purchase one from another player. Just like standard brewing stands, Boss brewers still need blaze powder to operate. You can find early game blaze powder in earth dungeon chests, then when underworld unlocks you can kill blazes for a more renewable supply.