Quick Travel / Taxi
Find the Pipe
Cross the Pipe
Fall Down to the Datacron
cross the pipe and fall down to the datacron
The Balmorra Purple Mastery Datacron is located in the Gorinth Canyon map on Balmorra grants Mastery +4 (it used to grant Willpower +4 before the stats changed).
The Balmorra Purple datacron is in the cliff above the canyon, crossed by a pipe and is only available to Republic characters (Imperial players must make a Republic character to unlock this datacron). Finding this datacron will give you a permanent stat boost of Mastery +4 to all your characters on your server, and will unlock the Galactic History 55: The Ascension of Exar Kun codex.
cross the pipe and fall down to the datacron