What is it for?
In Premiere Pro one can create nests: a sequences that can be used as a clip. However, if one wants to bring clips back from nest, "to un-nest" so to speak, it is not possible.
Grave Robber un-nests selected nests and multicam sequences.
When merging clips, audio data gets lost thus making it impossible to export proper AAF/OMF files.
Grave Robber un-merges clips and replaces them with original media, all keyframes, as well as applied effects will be preserved.