Adept Rider is a craftable set. While mounted, you gain Major Evasion, increasing your damage mitigation against area of effect attacks by 25%. Dismounting spawns a dust cloud at your position for 12 seconds that deals 1436 physical damage every 1 second to enemies who stand inside it. You and group members inside the dust cloud gain Major Evasion. The dust cloud can be created once every 12 seconds.
The Adept Rider set is part of the Summerset Chapter. The crafting station is located in Summerset (Northern Shimmerene). You can craft any armor, weapon or jewelry of this set in any motif style you know, as long as you have 3 traits researched (per item). You can trade crafted pieces to other players. Each set item becomes bound on equip.