A One-Round Living Greyhawk Geoff Regional Adventure
From the introduction:
Long ago, gnomish illuminators enchanted nine pickaxes as icons of Gnomish pride and power. When the giants came down from the mountains, the gnomes sent eight of these wonders to aid the Grand Duchy of Geoff. None returned to the hands of the gnomes. But the last one made was never sent against the giants. Its tale lies separate and apart from that of its brethren.