1-10

No encounter

11

1 behir

12

Roll 2d4 flumphs. They are detecting a nearby mind flayer that has enslaved Roll 2d4 quaggoths.

13

Gnoll pack - the first time this is rolled the pack is a gnoll fang of Yeenoghu and 10 gnolls. Subsequent times it's Roll 3d6 gnolls.

14

Roll 1d4 grell(s)

15

Roll 1d4 hezrou(s)

16

Roll 4d8 manes

17

Roll 2d4 minotaurs

18

1 monodrone. It Roll d2 on [1-3:is looking to rejoin its fellows and repeatedly says "We are on the march!";4:has gone rogue and repeatly says "Down with Primus!"]

19

Roll 2d6 quaggoths (one of them is a Quaggoth Thonot if there is more than five of them)

20

Roll 1d4 shrieker(s). If startled Roll d2 on [1-3: nearby monsters may be attracted, roll again on this table (treating another shrieker encounter as 'no encounter);4:nothing happens]