Website and data research by 101Leafy.
Cave of Oasis
オアシスのどうくつ, Dungeon
Cave of Oasis in Megami Tensei Gaiden Last Bible for the Game Boy Color, every floor and room in one picture. Hover a pin to see what it is; chests, shops, bosses, and exits to other places are links.
Monsters met here
Each step has the chance shown of starting a fight, halved once the hero is above the area's level. A fight picks one of 16 slots, so a group in 4 slots comes up 4 times in 16.