Hi, here is Poe4orbs. Today, we will share with you a knowledge that you may not pay attention  - Vaal Skill is Duration Skill

 

When a gem is corrupted into a vaal gem, a Duration tag is added. This means that vall skills can also enjoy the buff affix of duration tag.

For example, the normal Purity of Fire cannot be supported by the affix '+2 to Level of Socketed Duration Gems', but the Vaal Purity of Fire can.