Ruby Star

The Ruby Star is the fourth Crystal Star in the game Paper Mario: The Thousand-Year Door. The Ruby Star was originally owned by Doopliss, until the heroic plumber Mario defeated the Duplighost in combat.

Mario receives the Ruby Star after Vivian joins his team to help him get his name, appearance, and teammates back. Together, they confront Doopliss (who is disguised as Mario) and an epic battle ensues. Ultimately, Vivian and the real Mario defeat the doppleganger and recover the Ruby Star.

This Crystal Star teaches Mario the move "Art Attack", which costs 4 SP. To use this move, you must draw circles around enemies with the Ruby Star. Encircling an enemy completely causes maximum damage, while cutting corners cuts the damage as well. If you fully draw a circle around an enemy, it will cause 3HP damage. If most of it, then 2HP damage. If not most of it, then 1HP of damage.