A Courage Shell is an item found in Paper Mario: The Thousand-Year Door. Using one can boost Mario's or his partner's Defense by 3 points for two turns. Courage Shells can be bought in Petalburg and can also be stolen from Paratroopas.
In Super Paper Mario, it reduced damage players took by half. To make it more effective, players had to play a Mini-Game similar to Koops' Shell Shield.
Interestingly, the name "Courage Shell" applied earlier to a piece of armor available to Bowser in Super Mario RPG: Legend of the Seven Stars. In this game, the Courage Shell could be bought in Monstro Town and was one of many "shell" armors that Bowser could buy and wear.
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