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 dungeon potions it randomly gave you to extend the time on both.
Boss Brewer
To brew these potions, you need a boss brewer, a craftable 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.