Travel to Deadwind Pass and speak with the Dalaran Agent at Ariden's Camp (/way 52 35) to get Ariden's Sigil. Equip Ariden's Sigil or team up with another player who has it. Use Ariden's Sigil to ...

Engrave your belt with the Precision Timing rune: Slam is now instant but has ... the Agent will give you a unique trinket known as Ariden's Sigil that compels nearby Dark Riders to reveal themselves.