Claws of the Dragon
Each Discipline’s description describes the uses of Half-Magic and the circumstances where it can be applied.
A Half-Magic test’s Step is determined by adding half an Adept’s Circle—rounded up—to a relevant attribute. A character may spend a single Karma Point on any Half-Magic test.
If a character has learned a skill through normal means and also has access to it through Half-Magic, she may chooses which to use should circumstance apply. For example, an Archer gains access to the Craft Weapon skill through Half-Magic, but only to make ranged weapons. If she also knows the skill properly—allowing her to make non-ranged weapons—she may choose which Step, her half-magic or skill, when making a Craft Weapon check to create a bow.