Troll Fat is one of only two ingredients (the other is Imp Gall) which can be used to create Fortify Personality potions. Since these two ingredients also share the effect Damage Health once you reach Expert alchemy level, Expert alchemists can only make Fortify Personality potions that have a negative side-effect; only Journeyman alchemists can combine these ingredients to make a Fortify Personality potion without side effects. Master alchemists have the option of making a Fortify Personality potion from Imp Gall by itself, without any side effects; any grade of Alembic will reduce the Damage Health effect, with a Master Alembic reducing it to 1 damage for one second.
You will need one sample of Troll Fat to start Malacath's Daedric quest.
2 guaranteed samples can be found in the following locations (magenta crosses on map):
- 1 sample is in Howling Cave Lower Galleries
- 1 sample is in the Skingrad Mages Guild Living Quarters (display case, hard lock)
It can also be found randomly in the inventories of alchemy vendors (starting at level 9) and in some Monster loot chests (starting at level 6).
Troll Fat is dropped by most varieties of Trolls, including standard Trolls, Savage Trolls, Swamp Trolls, Azhklan Trolls (except at levels 1-3), and Kalperklan Trolls (except at levels 1-3). Troll varieties that do not drop Troll Fat are the Uderfrykte Matron and the Painted Trolls (who drop Painted Troll Fat instead).
Standard Trolls are most frequently encountered as randomly generated Monsters. In Monster Dungeons (circles on map), they will be at levels 8-16 (6-8 for boss-level monsters). Outdoors (squares on map), they are found in Forest and Rainforest regions. In the wilderness they appear starting at level 8; along roads, they appear starting at level 6. At high levels (17 and higher), they are only found in Forest regions (not Rainforest regions).
Below level 4, Troll Fat can only be obtained in a limited number of places (magenta circle and crosses), all of which are part of Fighters Guild quests. None of these trolls respawn:
- 15 Swamp Trolls are found in Swampy Cave as part of the quest Mystery at Harlun's Watch.
- 9 Savage Trolls are found in Nonwyll Cavern as part of the quest The Master's Son.
- 9 Savage Trolls are found in Forsaken Mine as part of the quest Trolls of Forsaken Mine.
Places where trolls who drop Troll Fat are guaranteed at levels 4 and higher are:
- 21 respawning Azhklan Trolls are found in Veyond (red circle).
- 3 respawning Kalperklan Trolls are found in Tidewater Cave (red circle).
Finally, at levels 6-8, trolls will be opponents in the Arena Grand Champion matches, if you ask to fight against two or three creatures.