Alchemy is the skill where you level up from making potions. Something to note is after you use redstone to extend a potion, or glowstone dust to level up a potion, you will not gain more xp for switching the potion from extended to level 2 potion.
Perks of leveling up Alchemy:
Level 1 Alchemy: Allows the creating of Water-Breathing potions (Allows a player to breathe underwater) using a lilypad in an Awkward potion.
Level 125 Alchemy: Allows the creation of Potion of haste (Faster swings) can be created by putting a Carrot in an Awkward potion. Alchemy 125 also allows the creation of the potion of dullness (Slows a person's swings down) can be created by putting slimeball in an Awkward potion.
Level 250 Alchemy: Allows the creation of the potion of absorption (Grants 2 non-refillable hearts per potion level) can be created by putting a nether quartz in an awkward potion. Alchemy 250 also allows the creation of the potion of leaping (Allows a player to jump higher) can be created by putting a rabbit foot into an awkward potion.
Level 375 Alchemy: Allows the creation of the potion of health boost (Grants 2 refillable hearts per potion level) can be created by putting an apple in an Awkward potion. Alchemy 375 also allows the creation of the Potion of Hunger (Increases the rate of hunger) can be created by putting rotten flesh in an Awkward potion.
Level 500 Alchemy: Alchemy 500 allows the creation of the Potion of Nausea (Makes a user's vision swirl) can be created by putting a brown mushroom in an Awkward Potion. Alchemy 500 also allows the creation of the potion of blindness (reduces user's vision) can be created by putting an ink sac in an Awkward Potion.
Level 625 Alchemy: Alchemy 625 allows the creation of the potion of saturation (Restores hunger bar automatically over time without need of food) created by putting a fern in an Awkward Potion.
level 750 Alchemy: Alchemy 750 allows the creation of the potion of decay (Causes damage over time similar to poison but does wither damage instead) created by putting a poisonous potato in an Awkward Potion.
level 875 Alchemy: Alchemy 875 allows the creation of the potion of resistance (Grants 20% damage reduction buff per level of potion) created by putting a regular golden apply in an Awkward Potion.
Catalysis: This is a passive skill that speeds up the creation of potions at level 100 Alchemy. It caps at speeding up potions to 4x the speed up to 1000 Alchemy. This is basically a multiplier that decreases the speed roughly .04 per Alchemy level.
