A compelling magic system in fantasy writing is one that is well-defined, consistent, and adds to the overall world-building and plot of the story. Here are some elements that can make a magic system compelling:

1. Clear rules and limitations: A magic system that is well-defined and has clear rules and limitations makes it easier for readers to understand and follow along with the story. This also prevents magic from being used as a "deus ex machina" to solve problems too easily.
2. Consequences: The use of magic should come with consequences, whether they are physical, mental, or ethical. This adds depth and realism to the world, and creates opportunities for character development.
3. Unique and creative: A magic system that is unique and creative can make a fantasy world stand out and be memorable. This can include using different sources of magic (such as elemental, necromancy, or blood magic), or having a system that requires a particular set of conditions or rituals to be met in order to work.
4. Integrates with the world: The magic system should integrate with the world and culture of the story. For example, in a society where magic is outlawed, the consequences of being caught practicing magic would be severe.
5. Mysterious and intriguing: A little bit of mystery and intrigue can make a magic system even more compelling. This can be achieved by leaving some aspects of the magic system unexplained or unknown, creating a sense of wonder and curiosity.
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