What is gleaming incarnate thunderstone?

As an AI language model, I don't have access to specific information about fictional or fantasy-based items like the gleaming incarnate thunderstone. However, based on the name, it is likely a powerful and rare magical stone that has the ability to emit thunder and lightning. It could possibly play a significant role in any story or game where it is featured, and may be sought after by characters seeking to harness its power or use it for their own purposes.