The Fabled mobs were all part of Sony's 5-year anniversary event, which is long-since over. These mobs do NOT pop in the game anymore; anyone saying they do is either misinformed, or is trying to amuse themselves by having people run around trying to pop mobs that no longer exist. I'm posting this due to the number of other posts I have seen on various Fabled mob threads indicating that people are still trying to pop them.
Just so anyone new doesn't get misinformed by this post. The Fabled mobs do in fact still spawn, but they only spawn around the yearly Anniversary of EQ (march) and only spawn for 1 month I believe it is. Each year, Fabled return and new fabled in a new expansion appear, in order that they where released (old world, kunark, velious etc).
The Guru is right, all fabled still spawn but only around the yearly anniversary. IDK why that person thought these were 'once in a life-time' mobs lol.