Rivendark's Egg
From WoWWiki
Rivendark's Egg is an egg among eggs that if used with 35 [Apexis Shards] will call down Rivendark. The egg can be found in Rivendark's Perch in Blade's Edge Mountains. [27.2, 64.8]
Objective of
Summons Rivendark for the quest 
[70G-5] To Rule The Skies.
