This was a strong control skill for Thieves that caused the target to lose control for up to ten seconds.
To be blinded during a battle basically meant that you lost their ability to fight, unless you used your badge to clear the control effect, or a comrade dispelled you in time. Of course, the Mage's refrigerator skill and Paladin's invincibility skill could also cancel the effect.
Despite this, Blind was still a very powerful skill.
However, he needed to purchase some Blind Powder to use it. Lu Li learned the skill straight away, but he couldn't cast it yet – this was a skill that required some casting material.
Blind Powder was an expensive poison, but Lu Li wasn't too concerned about this.
This wasn't a skill that he would use on monsters, but rather, a skill for PVP. The players that he successfully killed would cover the cost for him with their equipment.