Scrape
Reference
Mode
Sculpt Mode
Tool
Toolbar ‣ Scrape
The Scrape brush works like the Flatten brush, but only brings vertices above the plane downwards.
Area Radius
Ratio between the brush radius and the radius that is going to be used to sample the area center.
Invert to Fill
When enabled, holding Ctrl while sculpting changes the brush behavior to be the same as the Fill brush. When disabled, holding Ctrl while sculpting, will push vertices above the cursor up away from the cursor.