Troll

Trolls are great, lumbering, man-like beasts that haunt many wild and desolate regions of Middle-earth. Towering in stature and immense in strength, they are among the most physically formidable foes encountered by travelers. Trolls are universally hostile and will attack on sight, crushing their enemies with brute force.
In battle, Trolls are heavily resistant to Common damage due to their thick hides and stony resilience, but they are notably weak to Fire and Light damage, as well as to Songs. These vulnerabilities can prove decisive against such otherwise durable opponents.
Numerous breeds of Troll exist, each adapted to different regions and conditions. For a broader overview of their origins and varieties, see Troll-kind.
Index
A list of all known sightings:
Gallery of troll looks
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Balt-ologs in the Lone-lands
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Armored Balt-ologs in the Lone-lands
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Veteran Balt-ologs in the Lone-lands
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Cave trolls in Moria and Lothlórien
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A fire-imbued Jarn-olog in the Rift of Nûrz Ghâshu
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War trolls in the Harlond and Udûn
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Armored War trolls in the Harlond
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Armored trolls in Gundabad