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. Each weapon has a decent ratio, but also procs a swarm pet.
You may as well also collect Fabled Ball of Golem Clay from Earth while doing the rounds (drops from Fabled A Korascian Warlord). This gives you an earth elemental illusion, which increases strength and casts root.
Fabled Savage Platinum Fists (BST), drops from several named in field 1: Fabled Flame Wilder, Fabled Jopal Tracker, Fabled Obsidian Tree Spider Queen, Fabled Wild Fiery Spirit Steed.
Fabled Obsidian Battle Sword (WAR) drops from named in field 1: Fabled Jopal Crafter, Fabled Jopal Flame Protector, Fabled Jopal Lavahurler, Fabled Jopal Seer, Fabled Obsidian War Spider.
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).
None.
Guide to the traps in Plane of Earth.
Fabled Ball of Golem Clay (ALL) Fabled A Korascian Warlord from the frog traps, PH is A Korascian Warlord or Hunter.
Fabled Diaku Forged War Hammer (BER) The Fabled Diaku Armorer.