How do you get Darkblade in ff12?

Could you please elaborate on the process of acquiring Darkblade in Final Fantasy XII? As an avid player of the series, I'm particularly intrigued by the unique weapons and items available in each installment. Darkblade, as I understand, is a coveted sword that grants its wielder significant power. What are the specific steps required to obtain this elusive weapon? Is it a quest reward, a rare drop from a specific enemy, or something else entirely? Your insights would be greatly appreciated as I seek to complete my collection of legendary weapons in this game.