Exp. Booster

The Exp. Booster is an accessory in Super Mario RPG: Legend of the Seven Stars. It doubles the amount of experience points earned in battle when equipped, though the wearer does not have to actually participate in battle for it to work. Exp. Boosters can be bought from Frogfucius' Student for 22 Frog Coins, though can only be sold for 11 normal coins.