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Woestave is a Priest-only wand from a quest line involving Sunken Temple, and is a very good wand for a Shadow Priest. However, there are better endgame wands available, so the recommended choice of reward from this quest is the [Blessed Prayer Beads].
Source
Woestave is a quest reward from the quest Blood of Morphaz. This is a chain that starts with High Priest Rohan (Alliance) or Ur'kyo (Horde).