http://wiki.project1999.com/Ball_of_Golem_Clay
Drops in Cazic Thule, the zone, and gives Earth Elemental illusion for ~20 minutes or so.
As Melon said, Guise is usable by all from inventory, but no longer drops naturally and is very rarely awarded in rare GM events.
Amulet of Necropotence is usable from inventory by all, but drops from Cazic Thule, the god, and goes for hundreds of thousands of plat.
If you have been playing for less than a month, just reroll, run both characters to EC, and ask someone to transfer your items.