Thunder Palace

The Thunder Palace is an ancient temple located on Oho Oasis in Mario & Luigi: Superstar Saga. It is inhabited by the Thunder God. When Luigi entered the Thunder Palace, the Thunder God warned him to leave, for they had no business with each other. After the Thunder God left, Luigi touched the Thunder Spark, a blue orb located on a pedestal in the room. This infuriated the Thunder God. However, upon seeing Luigi was still alive after touching the Spark, the Thunder God taught him the Thunderhand technique.

Related

 * Fire Palace