Question

erasers can to get rid of our charcoal mark - making, but what else can we use it for, besides the obvious?
you can not do anything else with the eraser.
you can lift off the charcoal to create highlights in your drawing.

Explanation:

In charcoal art, erasers have a creative use beyond just removing marks. By selectively lifting charcoal from the drawing surface, artists can create bright, precise highlights that add depth and dimension to the work, which is a standard technique.

Answer:

You can lift off the charcoal to create highlights in your drawing.