The English word hell comes from her, and it brought almost none of her with it.
Old Norse Hel, Old English hell, Gothic halja and Old High German hella all descend from a Germanic root meaning to cover or conceal — the same root behind English hall, hole and helm. The word originally named a covered place, and when missionaries needed a vernacular term for the Christian place of torment, this is the one they took. Everything the word now carries — fire, punishment, moral sorting, the devil — arrived with the borrowing. None of it is in the Norse material.
What Snorri says she looks like
Gylfaginning is the only source that describes her, and it does so vividly. Odin throws Loki's daughter into Niflheimr and gives her authority over nine worlds, to apportion lodging to those sent to her — men who die of sickness and old age. She is half black and half flesh-coloured, easily recognised, and grim and threatening in appearance.
Her household in Snorri is a run of grimly comic names: her hall is Éljúðnir, "damp with sleet"; her dish is Hungr, hunger; her knife Sultr, famine; her manservant Ganglati and maidservant Ganglöt, both meaning something like slow-walker; her threshold is Fallandaforað, stumbling-block; her bed is Kör, sickbed, and her bed-curtains are Blíkjandaböl, gleaming disaster.
That is a superb piece of writing and it may be substantially Snorri's own. The older poems say nothing about her appearance at all. Völuspá mentions Hel only as a place; Baldrs draumar has Odin ride to a high hall where the benches are strewn with gold and the mead is brewed and covered with a shield, awaiting a guest — an image of expensive hospitality, not of a rotting queen. The half-corpse face that dominates every modern depiction rests on one thirteenth-century Christian's sentence, and it is fair to say so.
The one decision she makes
Her entire narrative role is a single ruling. When Hermóðr arrives after nine nights' ride to ransom Baldr, Hel does not refuse. She sets a test: if all things in the world, living and dead, weep for him, he may return; if anything refuses, she keeps him.
This is a legal formula, not a cruelty. She is being asked to release something lawfully hers and she names a condition of universal consent — the mythological equivalent of requiring every party to sign. When the giantess Þökk declines, Hel simply keeps what the terms give her. She never appears again in the narrative until the end of the world, when a ship crewed from her realm sails at Ragnarök.
She does not torture anyone. She does not judge anyone. She does not want anything.
Who actually goes there
Snorri's rule — sickness and old age to Hel, battle-death to Odin and Freyja — is tidier than the sources it summarises. Baldr goes to Hel and he was killed by a projectile. Brynhild rides there in a wagon. Egils saga's poem Sonatorrek has Egill's drowned son go to the goddess. The sagas frequently speak of the dead as remaining in their burial mounds, sometimes actively (see the draugr), and Grímnismál distributes the dead across a range of halls with no single scheme.
The honest description is that early Scandinavians held several incompatible ideas about the dead simultaneously — in the mound, in the sea, in a hall, under the earth — and that Snorri imposed a system on them because a systematiser's job is to produce a system. Most people, on any reading, went to Hel's realm, and the sources describe it as cold, dim and dull rather than punitive.
One passage stands apart: Völuspá's serpent-woven hall on the shore of corpses, where the perjured and the murderous wade venom and Níðhöggr feeds. Nothing else in Norse poetry sorts the dead by conduct, and that stanza's authenticity and placement have been argued over for a century precisely because it reads like an interpolation.
Person, place, or grammar
Norse uses hel as both a proper name and a common noun, and the boundary is not stable. "To go to Hel" in a saga may mean nothing more than "to die," the way English says "the grave." Whether a distinct goddess existed in pre-Christian belief, or whether the personification is a poetic device that Snorri hardened into a character, is unresolvable. There are no place-names, no amulets and no evidence of any cult — as one would expect for a death-realm nobody wanted to attract the attention of, but the absence still means the figure is known only through literature.
Her family is unambiguous where she herself is not: daughter of Loki and the giantess Angrboða, sister of Fenrir and Jörmungandr, one of three children the gods dealt with by removal — bind one, drown one, and give the third a job.
What modern versions did to her
Marvel's Hela, played by Cate Blanchett, is Odin's firstborn daughter, a conquering war-goddess with an antler headdress and a claim to the throne of Asgard. Every element of that is invented: the parentage, the ambition, the martial role and the throne. God of War and various novels have made her variously a schemer, a sympathetic outcast and a ruler of legions.
The source Hel does none of it. She receives, she houses, she holds to terms. The one genuinely eerie thing about her is that she is not an antagonist at all, and the modern imagination appears unable to leave that alone. For the wider structure of the Norse dead, see the tradition overview and how her realm compares in the underworlds set side by side.
Was Hel's realm underground, north, or across water?
All three, in different texts, and the inconsistency is not resolvable. Snorri sends Hermóðr downward and northward through dark valleys, over a gold-roofed bridge whose keeper remarks that he is the wrong colour for a corpse; Baldrs draumar sends Odin down and eastward instead. Later Scandinavian folklore held onto the bridge and the northward descent longer than anything else in the picture. For the crossing in full, see the realm itself.
Why does she get her own realm when her brothers are imprisoned?
Snorri presents it as a placement rather than a punishment, and the difference matters: the wolf is bound and the serpent thrown into the sea because they are threats, while Hel is given authority — the verb is one of granting jurisdiction. One reading is that death is not a threat to the gods in the way the other two are, so the third child can simply be assigned a portfolio. Another is that the story preserves an older death-goddess who was awkwardly fitted into Loki's family by a later systematiser, which would also explain why her siblings have careers and she has an office.