Enchantment

Magic in TwinWorld is based on creating arbitrary connections between things. In essense, this means bending and re-assigning causality. Instead of you using the broom to sweep the floor, the stream outside uses the broom to sweep the floor. Instead of the wind blowing through the leaves, the wind plays music on enchanted instruments. This "system" allows enough freedom to do stuff, while being specific enough to allow creative story-telling.

For Fay magic: See Life dust

For Zarth magic: See Mechanomancers