Right click on a wall of fire ( 437, 6, 403 ) /waypoint 437, 6, 403 and speak incantation of ice.
Climb up the wall of fire and kill The Enigma of Fire ( 407, 58, 338 ) /waypoint 407, 58, 338 (Level 58^^^ Heroic book mob containing 5 other level 58 Heroics).
Placeholder - Group of five of a mix of any of the following: a Faro' Nuk legionnaire, an Anuk' Sul visionary, a Sulite devotee, and a tome of medicine, a tome of wizardry, a tome of evasion, a tome of combat arts, and a tome of coercion. Ten minute respawn, takes several to spawn the named.
Right click on a wall of ice near Explorer Punja ( 449, 13, 533 ) /waypoint 449, 13, 533 and speak incantation of fire
Speak to Explorer Punja again
*Note: As of 09/10/2016 I spent 6 hours trying to spawn The Enigma of Fire to no avail. Not sure if it's broke, or just my dumb luck! Halls of Fate Server.