I wasted several thousand turns looking for the monster in TotHK (honestly, just plain unlucky since it was a berserker prince which is usually fairly common there and in the teens CoC), but..again, I play ADOM to have fun. Spending thousands of turns looking for a quest monster on cavernous levels is pretty opposite to my idea of fun (and, I imagine, most people's).
gate closers: GeWi GnMo(unarmed) DeAs/Pa/Mi(staves)/Ra GePr DrBb HrMo | p7: MeBf | p17: GnPr | p20: DrDu GnAs DeCk MeWp OrBf GnTh MeHe | R57: MeDu | R101: DrAs (26,674 turns) GnDu (26,748) DrAs (18,533)
ULE: HeRa — OCG: DeMi
currently speedrunning DrAs.