The concept is simple. Set a timer for 5 minutes and write something based on the prompt.
The challenge is surviving the consequences of casting a spell
My left leg tingles uncomfortably, as if I sat on the pot for the past half-hour thumbing through Wand Monthly. I ignore the discomfort and look to my partner, the thick eyebrowed Seamus, who has lost his bushy forehead adornment more times than either of us can remember. He is massaging his neck with one hand and squeezing the blood out of a decapitated duck with the other. Based on the pained expression on his face, I can tell he is experiencing the sympathy too. The brutal, unspoken side effects of casting. You receive a fraction of the spell yourself.