Earth Crystal

The Earth Crystal is an enemy encountered in battle alongside the optional boss Culex in Super Mario RPG: Legend of the Seven Stars. Like Culex and the other crystals, they are from the dimension of Vanda and met in a portal leading to that world found in Monstro Town. The Earth Crystal has the highest amount of HP out of all of the four crystals, but balances out with a dismal defense of 70.

Despite being the crystal of earth, it only has two earth-based attacks, Boulder and Sandstorm. It also wields Storm and Water Blast. It finishes up with the move Blast.

It is weak against Thunder-based attacks.

Trivia

 * All four of the Crystals originally appeared in Final Fantasy and featured prominently in Final Fantasy IV, from which Culex's theme music comes.
 * Paper Mario, which was conceived as a sequel, has the Crystal Bits serving much the same purpose and appearance alongside the Crystal King.