Wand Specialization was a mage talent that increased wand damage by up to 25% at max rank. Most mages use wand damage only as a last resort, making this talent less useful, especially when compared to other talents that could be taken in its place. It was removed from the game in patch 3.0.2.
Priests had a similar talent, [Wand Specialization] in their Discipline tree, which increases wand damage by 5% per rank, up to 25% at max rank.