Tower of the mad archmage

In a diversion from the usual events of the campaign, in last night's session (arranged to coincide with Gary Gygax's birthday) the PCs had an odd encounter with a tower which erupted abruptly from the ground near to where they were camped. Being keen adventurers they went to investigate it, and discovered it to be part of the castle of the mad archmage Zagyg. Of course they climbed inside, through an accessible window, and had a marvellously old-school time looting and pillaging! :) This was much to the dismay of the inhabitants of the castle - white-furred ape guards, floating eye spheres, and an amusingly non-violent group of robed figures who did nothing but flee in fear of the band of armed raiders.