How to get Scathe FF12?

Could you elaborate on the process of acquiring the Scathe weapon in Final Fantasy XII? As a collector of rare and powerful equipment in RPGs, I'm particularly interested in understanding the steps involved in obtaining this coveted item. Does it involve completing a specific questline? Or perhaps defeating a challenging enemy? Are there any prerequisites I should be aware of before embarking on this quest? I'd appreciate any insights or tips you could provide to help me on my journey to acquire the Scathe.