Spot / Fire Giant Lairs:

Thanks to Seville's Page

Drop down from the hole in the “Portals” room and be prepared to run South for safety. Coming South from the Fire Plains, you arrive in a larger room away from most of the Red Dragons that roam the Fire Plains. Calm spot to rest? 'Fraid not! The Fire Giant swinging a +6 Halberd resides in the east lair while a restless pet called Spot has a lair to the west. Fire Giant drops ProtFire Boots and his +6 Hally. FG Hally will not tie and blocks fairly well.

Source: Original mirror