What eraser can I use with wax core coloured pencils
Lifting something like the Prismacolor line with a hand-held eraser is going to require a lot of elbow grease. So, when the need arises, either for a misplaced line or trying to get an effect, then the best answer is an electric eraser. There are a few options out there, Sakura makes one that is quite popular and I have the Derwent model.

Are they perfect? No. Lighter colors lift easier, but the electric is going to do far better regardless. The only thing to bear in mind is that you're going to take some paper surface with you when you do this. For a small area, once, not a problem, but multiple times in the same place is probably unwise.

Your other option is to not erase at all. This means layers, layers, and more layers. Basically, the goal is to get enough color down that the mistake is, effectively, covered. How easy that is depends on the paper. Mine tends to be heavier and some colored pencil artists even go for watercolor paper. However, if your layers have gotten to the point when color no longer takes, a shot of workable fixative can give you back some tooth for adding more.