Carpenter's Tools
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The Carpenter's Tools (also known as Tools in the SNES/PS version) is a Key Item in Chrono Trigger.
In order to abtain them you need to go to 1000 A.D. Present and talk to the carpenter in the Choras Inn and ask him for his tool he say you can but you need to get them from his wife. You then go back to 600 A.D. Midle Ages and givr thrm to the carpenter in the tavern.