Shivering:Fain

Fain is inhabited by a group of Heretics who worship an unholy being known as Gyub. The Heretics sacrifice "volunteers" to Gyub by dangling them over the Pit of Fain, reciting a prayer to Gyub, and dropping them into the Pit to their deaths. 
 
Notes
This ruin contains 61 Flame Stalk plants, 5 Screaming Maw plants, and 10 Root Stalk plants.
Fain's pit contains the largest drop in the game, as the fall is greater than jumping off Dive Rock or Mount Sheogorath. 
For more information on the Heretical sacrifices in Fain, see the Lore Article. 

Exterior
thumb|right|Key to Maps|150px

The exterior is located at coordinates: SEWorld 11, 9
This location's map marker (M on map) is named Fain.  The entrance door is SE of the marker, 60 feet away.
3 Heretics are near the entrance
0-1 Monster (Mania) is near the entrance
The following plants can be found near the entrance: 5 Alocasia plants, 6 Aster Bloom plants, and 2 Hydnum Azure plants

 
Zone 1:
thumb|right|453px|Map of Fain
thumb|right|The Pit of Fain
Upon entering from door C, you will arrive in a large room with four enemies, including a boss-level Heretic (A), so try to use sneak to avoid facing all at once. In the southwestern corner are three bedrolls (b), a full set of novice alchemical equipment (E), various ingredients and a scroll shedding some light on this ruin. Loot the boss chest at B and head to the central area. Open the glass case and retrieve Gyub, Lord of the Pit before pressing the push button nearby and opening the trapped floor at F.

After what seems like an endless fall, you will drop into a large water pool with three enemies and the body of a less fortunate "volunteer" (K). Your objective is to reach door D, leading outside, so head east. Avoid the root spikes at I, loot the amber limb at H and open the root door at J. In the next room is a boss chest (B) and an amber stump (H), guarded by three enemies, including a boss-level Scalon. Make sure to loop around the next intersection to loot both hollowed stumps and exit to find yourself at the foot of the mountain, near the sea.

Occupants:
1 boss-level Heretic at location A on map
1 boss-level Scalon (Mania) at A
2 Heretic Mages (always best possible level)
6 Scalons (at low levels will be a Young Baliwog, Mania, always best possible level)
Treasure:
1 boss-level Chest (Heretic variety; locked) at location B on map
1 boss-level Hollowed Stump (Monster variety) at B
1 Hollowed Amber Limb (1-4 Amber; non-respawning) at H
1 Hollowed Amber Stump (1-4 Amber; non-respawning) at H
1 Chest
1 Hollowed Stump
2 Hollowed Stumps (Healing)
The following alchemy equipment will always be found: 1 Novice Alembic, 1 Novice Calcinator, 1 Novice Mortar & Pestle, and 1 Novice Retort
The following books will always be found: 1 Gyub, Lord of the Pit and 1 Scroll
The following ingredients will always be found: 2 Flame Stalks, 1 Red Kelp Gas Bladder, and 1 Smoked Baliwog Leg
The following plants will always be found: 61 Flame Stalk plants, 5 Screaming Maw plants, and 10 Root Stalk plants
Some of the above items are clustered at location E: 2 Flame Stalks, 1 Novice Alembic, 1 Novice Calcinator, 1 Novice Mortar & Pestle, 1 Novice Retort, 1 Red Kelp Gas Bladder, and 1 Smoked Baliwog Leg
Traps:
3 Root Spikes traps at I
1 Trapped Floor trap at F
Doors and Gates:
There are two doors (at D and C) in/out of this zone, both leading outside
1 Twisted Roots (opened remotely) at J
Other:
1 Dead Volunteer at location K on map
3 bedrolls at b

Bugs