Shivering:Swampgas Hole

Notes
There are two entrances to Swampgas Hole.  The main entry is near the map marker; the secondary entrance is east-northeast of the map marker, under the "n" of the map label "Heretic's Horn".
This cave contains 20 Mushroom Tree Sapling plants, 152 Root Stalk plants, 73 Rot Scale plants, 38 Thorn Hook plants, and 202 Withering Moon plants.

 
Exterior
thumb|right|Key to Maps|150px
thumb|right|280px|Map of Swampgas Hole exterior
The exterior is located at coordinates: SEWorld 8, -7
This location's map marker (M on map) is named Swampgas Hole.  The entrance door is SW of the marker, 70 feet away.
1 Monster (Dementia) is near the entrance
1 Wilderness Creature (Dementia) is near the entrance
The following plants can be found near the entrance: 1 Putrid Gigantea plant, 6 Grummite Egg Mound plants, and 2 Water Root Pod plants

 
Zone 1:
thumb|right|389px|Swampgas Chasm
With the highest concentration of Rot Scale, Thorn Hook and Withering Moon plants in the Isles, Swampgas Hole is a paradise for the budding alchemist and is also a good place for leveled loot. The first zone is quite linear: just make your way through the root tunnels to door E. As soon as you enter, avoid the Spore Pod trap at T and loot the amber limb at H. At the next intersection, the roots at I will block the way: head north and remember to loop around it in order to collect some loot from a hollowed stump. Head south again and open the roots at J to gain access to a boss chest (B) and an alternate entrance (D). Loot the amber limb at H and enter Swampgas Burrows via door E.

Occupants:
15 Monsters (Dementia, always best possible level)
Treasure:
1 boss-level Hollowed Stump (Monster variety) at location B on map
2 Hollowed Amber Limbs (1-4 Amber; non-respawning) at H
3 Hollowed Stumps
1 Hollowed Stump (Healing)
The following plants will always be found: 16 Rot Scale plants, 18 Thorn Hook plants, 2 Mushroom Tree Sapling plants, 76 Root Stalk plants, and 99 Withering Moon plants
Traps:
1 Spore Pod trap at location T on map
Doors and Gates:
There are three doors in/out of this zone
2 doors (at C and D) lead outside
1 door (at E) leads to the zone Swampgas Burrows
2 Twisted Roots (opened remotely) at I and J

 

Zone 2:
thumb|right|287px|Swampgas Burrows
Once again, this zone is extremely linear: make your way through the root cave, picking up the wide range of flora along the way. In the first room, you may immediately enter the final zone, Swampgas Depths, through door F. However, pressing on till door G, leading to the same zone, is recommended. Be sure not to miss the two hollowed stumps of this zone: one in the lower level of the first zone and one in the south-easternmost corner of a small loop. Head to door G and proceed to the next zone.

Occupants:
12 Monsters (Dementia, always best possible level)
Treasure:
2 Hollowed Stumps
The following plants will always be found: 20 Rot Scale plants, 14 Thorn Hook plants, 10 Mushroom Tree Sapling plants, 43 Root Stalk plants, and 69 Withering Moon plants
Doors and Gates:
There are three doors in/out of this zone
1 door (at E) leads to the zone Swampgas Chasm
2 doors (at F and G) lead out of dungeon to Swampgas Depths

 
Zone 3:
thumb|right|287px|Swampgas Depths
Depending on your choice in the previous zone, you will arrive in this zone from either door F or G. If you chose the latter, immediately loot the amber stump at H and avoid the spore trap at T. At the next intersection, heading left is recommended, as you gain access to a hollowed stump. Press on to the final large room in the southwest, where you will find a boss chest (B) guarded by a boss-level monster (A). Head north and exit through door F for much quicker access to the first zone.

Occupants:
1 boss-level Monster (Dementia) at location A on map
13 Monsters (Dementia)
Treasure:
1 boss-level Hollowed Stump (Monster variety) at location B on map
1 Hollowed Amber Stump (1-4 Amber; non-respawning) at H
1 Hollowed Stump
1 Hollowed Stump (Healing)
The following plants will always be found: 37 Rot Scale plants, 6 Thorn Hook plants, 8 Mushroom Tree Sapling plants, 33 Root Stalk plants, and 34 Withering Moon plants
Traps:
1 Spore Pod trap at location T on map
Doors and Gates:
There are two doors (at F and G) in/out of this zone, both leading to the zone Swampgas Burrows
Other:
1 bedroll at location b on map