2

Roll 1d2 Shambling Mound(s)

3

1 Young Black Dragon

4

Roll 2d4+1 Wights

5

Roll 1d3 Giant Crocodiles

6

Roll 3d6 Lizardfolk led by a Lizard King

7

Roll 1d4 Trolls

8

Roll 2d6 Ghouls lead by Roll 1d4+1 Ghasts

9

1 Giant Crocodile and Roll 1d4+1 Crocodiles

10

1 Hydra

11

Roll on "Swamp Low" (lower-level encounter)

12

Roll 1d2 Shambling Mound(s)

13

1 Druid with Roll 2d6 Giant Toads or Giant Lizards

14

Roll 2d4 Yuan-ti Malisons

15

Roll 4d6 Tribal Warriors led by Roll 1d4+1 Scouts

16

Roll 1d3 Wights with Roll 3d4 Zombies

17

Roll 3d6 Orcs led by an Eye of Gruumsh

18

Roll 1d3 Revenants

19

1 Yuan-ti Abomination

20

A coven of 3 Green Hags