Stone Helm (also known as Rock Helm in the SNES/PS version) is headgear in Chrono Trigger . It has 20 defense and is the starting equipment for Ayla . It can be traded in Ioka Village Hut or found in a chest at the Reptite Lair . It sells for 1000G and can be equiped by Crono , Marle , Lucca , Robo , Frog , Ayla , and Magus .