Zuo Zimu brought two pieces of Artifact Equipment as "evidence" for the ransom, which were a Treasure Sword and a exquisitely crafted ornament:
Dragon Mark Sword (Artifact): A treasure sword above the Sword God level, carved with a dragon pattern, seemingly containing some mysterious power.
Attack +600, Inner Strength Amplification 60%, Health Recovery Rate +100%, Swordsmanship Level +1!
The attack power of this sword is only average, but the 60% Inner Strength Amplification is the highest Ye Weiming had seen among all weapons to date, though, when converted into attack power, it wasn't that much.
Compared to the 40% amplification of the Golden Light Sword, it only had a bit more than 100 points of basic Inner Strength attack.
The sole advantage was probably that the Inner Strength amplification had a more comprehensive influence on combat ability, not limited to just an attack.