These drop in the Elemental planes, during the Fabled period (typically March 16 – April 16), and are considered among the best, if not the best, weapons for their class for 75-79.
It is also a good idea for any melee class to collect Fabled Ball of Golem Clay from Earth while doing the rounds.
Doomfire, the Burning Lands (Fire)
Fabled Spear of Fire (PAL) Fabled Vicar of Fire, C1 (fixed spawn spot), Fabled Captain of Fire (fixed spawn spot), and Fabled Charmer of Fire
(Fabled Fiery Staff of Zha (MNK/BST, 2HB, non pet) C2, Fabled General Reparm)
Eryslai, The Kingdom of Wind (Air) – none
Reef of Coirnav (Water)
Fabled Coral Hilted Shortsword (BRD) Fabled Ferocious Barracuda – tunnel to right, next cave over
Fabled Opalescent Two-Handed Sword (SHD) Fabled Razorfin – first big room from zone in
Vegarlson, the Earthen Badlands (Earth)
Fabled Sharp Gem Formation (ROG) Fabled A Pristine Gem Golem, Fabled A Shimmering Gem Sentry – past locked door, any trap in the two north corridors; requires key from Tantisala Jaggedtooth to access
Fabled Earthen Fist (MNK) Fabled Ancient Vekerchiki Champion – traps on stone structure in south
Fabled Whip of the Earthcrafter (RNG) Fabled A Prismatic Basilisk – gator traps on north wall
Drunder, Fortress of Zek (Tactics)