Potions can be obtained through, quests, drops, buying off other people and through the item shop. They can be used to grow you into a GIANT Size, or shrink you into a tiny size, or boost you xp and ability gains, or even make you invisible.
Elixirs can be obtained only from the item shop or buying off other players. They are alot more expensive than potions because they are much more powerful and last much longer.
Growth Potion: Increases your size
Super Growth Potion: Greatly increases your size
Shrink Potion: Reduces your size
Super Shrink Potion: Greatly reduces your size
Invisibility Potion: Makes you look transparent and prevents mobs from detecting you for a short time.
Work in progress