Elixir Master is a specialization of Alchemy. It allows an alchemist to sometimes create an additional elixir when brewing elixirs. Note that this effect also applies to the creation of Flasks, which are considered a variation on elixirs.
Each time it procs, it may result in some number of extra elixirs, typically 1-3 extras (IE 2-4 total), but getting as many as 10 extra has been reported. Low-level flasks can proc, but higher-level flasks proc more often. The average gain from procs on the highest-level flasks is about 25%.
Obtaining the Elixir Master specialization
An alchemist who has specialized in one of the other two specializations can switch to this mastery at any time. See Changing Specializations for more information.
- Patch 5.0.4 (2012-08-28):  is now a level 90 quest and requires MoP flasks to complete.
- Patch 4.3.0 (2011-11-29): Elixir Master is now rewarded from  and requires different materials.
- Patch 3.1.0 (2009-04-14): The amount of flasks produced by existing recipes has been doubled. Affected recipes always produce an even number of extra flasks when they proc.