The purpose though of One Man's God is to talk about demons. So let's get to it.
There are a lot of great entries for gods here and there are some really powerful monsters. But there isn't really anything here that says "demon" as D&D defines them. Or is there?
Among the creatures, we have the children of Loki, who here is listed as Chaotic Evil, who certainly could be considered demons. The Fenris Wolf is variously described as demonic and is Chaotic Evil. The same is true for Jormungandr. But they really don't fit the notion of demons. There is a type of creature from Norse Myth that does, the Jötunn.
Jötunar as Demons
There are a lot of good reasons to list the Jötunn as demons, even in the classical sense. The word Jötunn is often translated as "giant" or even "troll," but another translation is "devourer." This word is also the source of the word Ettin.
They are also described as predating the gods, coming from the primordial chaos, and the enemies of the gods. Sounds pretty demonic to me. It also sounds like the Titans of Greek myth, but more on that later.
The D&DG tells us that,
This lives on in the 4th Edition D&D mythology about Giants, Titans, and Primordials.
Jötunn, Inferno
FREQUENCY: Very Rare
NO. APPEARING: 1-4
ARMOR CLASS: -2
MOVE: 24"
HIT DICE: 15+75 (143 hp)
% IN LAIR: 0%
TREASURE TYPE: E, Q (x10), R
NO. OF ATTACKS: 2
DAMAGE/ATTACK: Flaming Sword 2d12+5 (x2)
SPECIAL ATTACKS: Fire Aura (2d6)
SPECIAL DEFENSES: +2 or better weapon to hit
MAGIC RESISTANCE: 55%
INTELLIGENCE: Average
ALIGNMENT: Lawful Evil
SIZE: L (20')
PSIONIC ABILITY: Nil
The progenitors of the Fire Giants, the Inferno Jötunn are a truly horrible sight to behold. They tower over the Storm Giants and rival the Titans in sheer size and strength. They are surrounded by flames and even their eyes, hair, and mouths are filled with flames. They are more violent than their cousins from Niflheim and Jötunheimr, the Rime Jötunn, but leave their lands much less often.
Inferno Jötunn all come from the land of Muspelheim, also known as Múspell which is also another name for these creatures. Muspelheim is a land of bright, white-hot flames that only these creatures and their fire giant offspring can withstand.
Inferno Jötunn are surrounded by flames that deal 2d6 hp of damage at all times. They wield great swords of flame and attack with their great strength (2d12+5) twice per round. Inferno Jötunn are immune to normal and magical fire including dragon breath. They have magic resistance at 55%. Rare individuals can also cast spells as a 9th level magic-user.
Their king is Sutur, also known as Surt. He commands his subjects with an iron fist.
Jötunn, Rime
FREQUENCY: Very Rare
NO. APPEARING: 1-4
ARMOR CLASS: -3
MOVE: 24"
HIT DICE: 18+90 (171 hp)
% IN LAIR: 0%
TREASURE TYPE: E, Q (x10), R
NO. OF ATTACKS: 2
DAMAGE/ATTACK: Frost brand sword 2d12+6 (x2)
SPECIAL ATTACKS: Chill Aura (2d6)
SPECIAL DEFENSES: +2 or better weapon to hit
MAGIC RESISTANCE: 55%
INTELLIGENCE: Average
ALIGNMENT: Chaotic Evil
SIZE: L (21')
PSIONIC ABILITY: Nil
Rime Jötunn are the primordial Frost Giants that first rose from Niflheim. Unlike the Inferno Jötunn, they range far and wide and are constantly battling with the Gods and other giants.
Rime Jötunn are surrounded by an aura of cold that deals 2d6 hp of damage at all times. They wield great swords of ice and attack with their great strength (2d12+6) twice per round. Rime Jötunn are immune to normal and magical cold including dragon breath. They have magic resistance at 55%. Rare individuals can also cast spells as a 9th level cleric.
These Jötunar can also adjust their size to appear as a human or elf as they need.
Niflheim is a cold, dark place of mists, ice, and gloom. Here the Rime Jötunn await with their lord Thrym to wage the final war on the gods in Ragnarök. Until they will cause as much evil as they can.
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Rereading the Norse Myths you get the feeling that the Jötunar are more elemental in nature than even the fire and frost giants of D&D. Again in this respect, D&D 4th Edition had some great ideas.
While there are plenty of supernatural creatures in the lore of the Norsemen, with trolls and giants among the more popular, they are not represented in the D&DG and indeed mainly play a lesser role to the Gods and the dwarves of Norse myth.
And here are. The last of the regular entries for One Man's God. I have a few specials in mind to wrap up some ideas from this series and a "Norse Mythos, Part II" in a way later this week with a new "This Old Dragon." All in all, I am a little sorry to see it end. It has been a lot of fun.