Cave, Prehistoric:
1 check / 200' of hallway or tunnel: Roll 1-D20 -- Roll needed for encounter: 15+
1 check / chamber or room: Roll 1-D20 -- Roll needed for encounter: 7+
%Roll: Encounter types:
01-05: Ankylosaurus
06-45: Bear, Cave
46-90: Cat, Saber-toothed Tiger
91-92: Character G.M.: Pre-make all NPC character encounters.
93-94: Jahtha
95-96: Jahthein
97-98: Nature
99-00: Race