• Handbook of Backstab IX
• Item Level 60Disenchants into:
  Not disenchantable
• Classes: Rogue
• Requires Level 60
• Use: Teaches Backstab (Rank 9).
• 1 Charges

Handbook of Backstab IX teaches Backstab (Rank 9).

Source

Handbook of Backstab IX drops from any of the bosses in the Ruins of Ahn'Qiraj.

Notes

As of Patch 2.0, Backstab (rank 9) can be learned from any rogue trainer at level 60.

Patches and hotfixes

Patch 1.9.0 (03-Jan-2006): Added 

External links

• Battle.net (EU)
• Wowhead
• Thottbot
• WoWDB