Before setting sail for the mission in Twin Canyon, Xia Nan had already paid a deposit of 1000 gold coins for the creation of [Abyssal Stream]. For a piece of Blue Rare Quality equipment, especially a full set with both an inner lining and outer armor, this is certainly far from sufficient.
Being part of the Blue Equipment, the reason Xia Nan previously only spent about 1000 gold in upgrading [Dark Scale Guard] at Barn's "Rock Hammer" was because the main material of the arm shield—the scales from the Snake Cave Secret Realm—didn't require him to spend extra money.
Later, when customizing the [Ash Fall] Straight Sword, due to the reason of "Yangli Iron Plating Powder," Xia Nan spent a full 3000 gold to obtain this weapon that matched his own [Embers Resonance] record as Half-Purple Equipment.
Currently, although [Abyssal Stream] is not comparable to [Ash Fall] in terms of Quality Level, the body materials from Shark Beast provided most of the materials needed for its creation.
