Indeed, the activation of a powerful set ability.
Strictly speaking, in terms of equipment properties of quality, a set equipment would be a little bit inferior to a dark-gold grade equipment. This was because a dark-gold grade equipment normally didn't possess a negative property, while the flaws and strengths of a green grade equipment was normally obvious.
As for why the value of set equipment frequently triumph over a dark-gold grade equipment, was because of its incredible special set ability!
The present phenomenon was caused by the special ability of Zi's set equipment – 'Marsh Decay'.
[ Set ability: Marsh Decay – when dealing damage to the opponent, there's a fixed chance of transforming your nearby surroundings into the environment of the Kijuju Marshland. Reduces movement speed and includes a chance of infection with various pestilences (set wielder will be immune to negative effects) ]
