The 第三道屏障的钥匙 is an Important Item in 异度神剑X. It must be obtained during 歼灭蒂法尼亚 along with the 第一道屏障的钥匙 and the 第二道屏障的钥匙 to lower a forcefield. It can be found in 黑钢大陆's 格罗斯洞窟基地, on the eastern ledge of the southeast room.
Map showing the location ("3") of the 第三道屏障的钥匙
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