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Obsidian Tie Event
Collect any armor set from Dragonflight PvP Season 2.
The Obsidian Tie Event achievement is earned during Dragonflight PvP Season 2 by collecting a full armor set from the Obsidian Aspirant's PvP honor gear, purchased from Seltherex in Valdrakken's Gladiator's Refuge.
Visit Seltherex in Valdrakken
Go to Seltherex in Valdrakken's Gladiator's Refuge and purchase your armor type's full set: 
Ensemble: Obsidian Aspirant's Cloth Armor, 
Ensemble: Obsidian Aspirant's Leather Armor, 
Ensemble: Obsidian Aspirant's Mail Armor, or 
Ensemble: Obsidian Aspirant's Plate Armor using Honor, found under the Primal Elements > Aspirant section of the vendor.
Buy the correct cloak
When completing the set, purchase the correct back piece — for example, Warriors must select the Greatcloak variant listed in the set tab, as picking the wrong cloak will leave the set incomplete.
Equip every armor piece
Equip each purchased piece so that the items are no longer refundable; the achievement will not trigger until all pieces have been equipped at least once.
Tips
The Comp Stomp Brawl is an efficient way to earn Honor quickly when it is active.
Once Season 2 ends, this achievement is expected to become unobtainable until a future expansion when the gear may be sold for Marks of Honor.