I am currently working on the outline for my fantasy novel. I have decided my protagonist, my antagonists, and I have a rough outline of the beginning, middle, and end. I have a pretty good idea about my world's races and the geopolitical situation. I am currently developing the magic system the characters in the story will use, specifically my male main character. So far it is only vague concepts and ideas, but I need them to take solid form. What I have so far: To cast magic you need a specific kind of crystal. If this crystal is not touching your skin then you physically can not cast spells. Spells themselves are made from words of another language, an old eldritch one used by the old elves and demons. Spells themselves can create wards to protect you against damage, summon fire to burn your foes, bring forth light in dark places, and heal grievous injuries. My problem is that I have a hard time fleshing this system out and giving it limitations and weaknesses. While this system would lean more on the soft side I do not want it to be a crutch I can rely on whenever my characters are in a hard spot. I want it to be a bit more gritty. My character can heal his severed leg, but what is the cost of doing so? I have gotten some really good advice on this website before, so I am hoping some of you can help me out yet again. Thank you for reading.