David Brin - Practice Effect

The narrative centers around a character named Kieran who finds himself in a parallel universe known as the “Tirn.” In this world, objects can become more effective through practice—meaning the more you use an object, the better it performs. This principle affects everything from weapons to everyday items, creating a society where skill development and mastery of tools are paramount.

Kieran, a skilled user of a special tool called a “luz,” discovers that he can manipulate his environment and enhance his abilities through repeated use. However, this also leads to unforeseen consequences, as the effects of practice can create imbalances and societal challenges.

As Kieran navigates this strange world, he encounters various characters who are both allies and adversaries. He grapples with the moral implications of his newfound abilities and the responsibilities that come with them. The story evolves into a quest for understanding the true nature of skill, the ethics of enhancement, and the potential dangers of unregulated power.