d100 Encounter
21 – 25 1 red dragon gliding through the sky above the highest mountaintops
26 – 30 1d8 + 1 manticores
31 – 35 1d4 cyclopes
36 – 40 Heavy snowfall that lasts for 1d6 hours
41 – 45 1d10 air elementals
46 – 50 1d6 + 2 bulettes
51 – 55 1d4 stone giants
56 – 60 1 fire giant
61 – 65 2 stone giants playing catch with a boulder a few hundred feet away
66 – 70 1d8 + 1 ettins
71 – 75 1d3 frost giants
76 – 80 A wide crevasse, its depths shrouded in mist
81 – 85 1d4 cloud giants
86 – 90 1 adult silver dragon
91 – 96 1 adult red dragon
97 – 98 1d4 rocs
99 1 ancient silver dragon
00 1 ancient red dragon
Mountain Encounters (Levels 17–20)
d100 Encounter
01 – 05 1d10 bulettes
06 – 10 1d8 + 1 chimeras
11 – 15 1 adult silver dragon
16 – 20 1d8 + 1 wyverns
21 – 25 A massive boat perched atop a mountain
26 – 30 2d4 galeb duhr
31 – 35 1d4 frost giants
36 – 40 A wooded valley haunted by secretive and reclusive elves who tell warily of their master: a mad wizard who lives in the heart of the valley
41 – 45 1d10 air elementals
46 – 50 1d6 + 3 trolls
51 – 55 1 adult red dragon
56 – 60 1d4 cloud giants
61 – 65 A waterfall hundreds of feet high that drops into a clear pool