How much fatigue before it affects my body, and if the magic could be stopped.
First, I'll start by determining the Danger Line where using more than what's available in my body will cause me to collapse.
Chanting, I waited for light to be produced.
While fully concentrating, I felt mana coming out of my body.
The sensation was similar to bleeding out.
The tired feeling gradually closed in so I thought for the light to go out in my mind.
The light properly vanished, so while letting out a sigh of relief I confirmed my physical condition.