Appearance and personality
Little is known about Magni's appearance.
Magni is Chaotic Good in alignment.
Magni is called God of Strength. He also shares his title "The Steadfast" with his brother Magni.
Magni's strength is legendary. He is said to be able to lift practically anything, even things said to be impossible to lift. He can bend anything which he can grip, and put his fist through anything. He can catch any weapon thrown at him and throw it back.
Magni is exceptionally tough. He cannot be harmed by bludgeoning weapons.
Magni is a god of strength.
Details of his worship are unknown. His followers are likely to value strength.
Little is known about the habits of Magni's clergy. They are likely to be Chaotic Good in alignment.
Temples of Asgardian deities tend to be heavily fortified buildings. However, unique features of Magni's temples are unknown.
Magni's holy symbol is a mountain.
Magni has no known enemies.
As a son of Thor, Magni is likely to fight alongside the Aesir at Ragnarok.
Magni rides the horse Gullfaxi, which was given after he rescued Thor who was trapped under the body of a giant.
Magni lives in Asgard. He has no hall of his own.
Prophecy of Ragnarok
Magni is first named in Gods, Demi-Gods & Heroes (1976), p.27,32.
AD&D 1st edition
AD&D 2nd edition
Magni is detailed in the Planescape sourcebook On Hallowed Ground (1996), p.147.
D&D 3rd edition
Magni is named in Deities and Demigods (3e) (2002), p.165,192.
D&D 4th edition
The Norse pantheon does not appear in D&D 4th edition.
Magni appears in Norse myth. In Skaldskaparmal, part of the 13th century Prose Edda, Snorri tells the story of Thor's fight with the giant Hrungnir. Thor defeats Hrungnir, but is trapped beneath the massive giant's leg. All of the Aesir try to lift Hrungnir's leg, but are unable. Magni, son of Thor and Jarnsaxa, shows up and lifts.
Magni and Modi are mentioned together in various poems as the sons of Thor. However, only Magni's mother is named, and it is not definitively stated whether Modi is Magni's brother and son of Jarnsaxa, or his half-brother by some other mother. D&D canon assumes that they are brothers.