Were you looking for the  Brutal Nether Drake Feats of Strength achievement?

• Brutal Nether Drake
• Binds when picked up
• Requires Riding (300)
• Item Level 70Disenchants into:
  Not disenchantable
• Use: Teaches you how to summon this mount. Can only be summoned in Outland or Northrend. This is an extremely fast mount.
• Cooldown: 3 seconds

Qualifiers for this mount should also get the  Brutal Nether Drake Feats of Strength achievement.

Source Edit

Rewarded when Arena Season 4 ended to all players who were in the top 0.5% of arena teams per battlegroup.

External links Edit

• Battle.net (EU)
• Wowhead
• Thottbot
• DB MMO-Champion