Talk to Kuron to get enchanted to visit the Basilisk. She is located in the lower part of Volcano Town.
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She will tell you with a clue to kill a specific monster and bring it back to her. Most monsters will be in the Maeling Forest AKA the Badlands. Once back, type:
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When enchanted, you will be allowed into the lair.

Monster clues:
Forces to ground:  Beshita
Frogfaced one:  Bullywog.

Enter the Basilisk Lair and kill it. Take the corpse and tan it for scales. You can trade the scales for a shield with Bavic in the lower part of Volcano Town.