Brush Behavior
The Paintbrush in the Terrain Editor paints elevations by default, but this is not the only way of painting using the brush. You can also set the brush to paint effects. This lets you apply elevation effects locally, or to increase/decrease existing gray levels in your Terrain Canvas.
The Brush Behaviors are located at the bottom left of the Terrain Canvas Tool. The Brush Behaviors are discussed a bit further down in the "Paintbrush Controls" section.

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