1. Many years ago, an extremely powerful magician called the Grand Witch one day took several people of various kinds to train them in various styles of magic. These became the Colored Witches.

2. Tasked with objectives given in the form of prophetic visions, immortality and a hat of your corresponding color & a wand for the witch's specific form of magic, their duty was to preserve the many magical styles of the world of the Ideaverse by practicing it's various magicks.

3. The Brown Witch was one of them, and the spell she was chosen to learn and preserve was alchemy (specifically, the whole potion-brewing part of alchemy). Armed with a syringe/wand hybrid capable of using potions of various kinds, her hat, self made gloves and the clothes on her back, she """"dutifully"""" performs her task of preserving the arcane art of alchemy.

4. She mostly just blows things up with her potions. This is what happens when your instructions are vague, with things along the line of 'just keep brewing stuff lol'.