The Stole of the Sun, the artifact linked to Aohalim, was lost in the desert wastelands of Suryanasta 137 years ago. It was being carried by a skilled warrior devoted to the Shining Lord when her caravan was ambushed by powerful undead. Everyone was killed and the Stole was taken and hidden in Mezekesh, a city that exists only in mirages.
The Armor of the War-King, Brand’s artifact, was buried in the tomb of a Caedmon warlord, once a mighty servant of Brand, after he fell in battle against a trio of death slaad assassins (though he took all three with him in the fight). He was laid to rest in a powerfully warded tomb on a small island off the coast of Caedmon roughly 200 years ago. Unfortunately, it seems grave robbers broke in shortly after. The magic invested in the tomb sunk the whole little island beneath the icy waters.
Parushan’s blade, Corruption, was destroyed a short time ago (by celestial standards) by a group of mercenaries-turned-semi-heroes.
Targan’s Cloak, the Cloak of the Elf-Lord, was stolen from the Grand Temple in Lorlynia 376 years ago. It is supposedly held by a mighty priestess of Kithra somewhere within one of the great mountains of the world.
The Blade of the Goblin Hordes is somewhere in the Southern Kingdoms, most likely Ulruz.
Eraekoth’s Skycleaver is kept far beneath the waves by the ancient Grandfather Kraken as part of the monstrosity’s massive hoard of sunken treasures.