Ultra Stone

The Ultra Stone is a key item that appears in Paper Mario.

History
The Ultra Stone can be obtained from Raphael the Raven after he and his Ravens finish building the zipline that leads Jade Jungle to Mt. Lavalava. With the Ultra Stone, Mario can now upgrade his partners to the Ultra Rank increasing their HP, attack power, and gives them newer moves. Note that Mario must locate the Super Blocks first and his partners must already be at the Super Rank.

Trivia

 * The Ultra Stone shares it's sprite with the Crystal Ball except for a different color.