In order to make the significance of this passage clear, it is necessary to explain the meaning of speech-runes or mal-runes.
Several kinds of runes are mentioned in Sigrdrifumal, all of a magic and wonderful kind. Among them are mal-runes (speech-runes). They have their name from the fact that they are able to restore to a tongue mute or silenced in death the power to mæla (speak). Odin employs mal-runes when he rists i runom, so that a corpse from the gallows comes and mælir with him (Havam., 157). According to Saxo (i. 38), Hadding places a piece of wood risted with runes under the tongue of a dead man. The latter then recovers consciousness and the power of speech, and sings a terrible song. This is a reference to mal-runes. In Gudrunarkvida (i.) it is mentioned how Gudrun, mute and almost lifeless (hon gordiz at deyja), sat near Sigurd's dead body. One of the kinswomen present lifts the napkin off from Sigurd's head. By the sight of the features of the loved one Gudrun awakens again to life, bursts into tears, and is able to speak. The evil Brynhild then curses the being (vettr) which "gave mal-runes to Gudrun," that is to say, freed her tongue, until then sealed as in death.
Those who are able to apply these mighty runes are very few. Odin boasts that he knows them. Sigrdrifva, who also is skilled in them, is a dis, not a daughter of man. The runes which Hadding applied were risted by Hardgrep, a giantess who protected him. But within the court here in question men come in great numbers (thjódir), and among them there must be but a small number who have penetrated so deeply into the secret knowledge of runes. For those who have done so it is of importance and advantage. For by them they are able to defend themselves against complaints, the purpose of which is "to requite with consuming woe the harm they have done." In the court they are able to mæla (speak) in their own defence.
Thus it follows that those hosts of people who enter this thingstead stand there with speechless tongues. They are and remain mute before their judges unless they know the mal-runes which are able to loosen the fetters of their tongues. Of the dead man's tongue it is said in Solarljod (44) that it is til trés metin ok kolnat alt fyr utan.
The sorrow or harm one has caused is requited in this Thing by heiptir, unless the accused is able—thanks to the mal-runes—to speak and give reasons in his defence. In Havamál (151) the word heiptir has the meaning of something supernatural and magical. It has a similar meaning here, as Vigfusson has already pointed out. The magical mal-runes, wound, woven, and placed together, form as it were a garb of protection around the defendant against the magic heiptir. In the Havamál strophe mentioned the skald makes Odin paraphrase, or at least partly explain, the word heiptir with mein, which "eat" their victims. It is in the nature of the myth to regard such forces as personal beings. We have already seen the spirits of disease appear in this manner (see No. 60). The heiptir were also personified. They were the Erinnyes of the Teutonic mythology, armed with scourges of thorns (see below).
He who at the Thing particularly dispenses the law of requital is called magni. The word has a double meaning, which appears in the verb magna, which means both to make strong and to operate with supernatural means.
From all this it must be sufficiently plain that the Thing here referred to is not the Althing in Iceland or the Gulathing in Norway, or any other Thing held on the surface of the earth. The thingstead here discussed must be situated in one of the mythical realms, between which the earth was established. And it must be superhuman beings of higher or lower rank who there occupy the judgment-seats and requite the sins of men with heiptir. But in Asgard men do not enter with their tongues sealed in death. For the einherjes who are invited to the joys of Valhal there are no heiptir prepared. Inasmuch as the mythology gives us information about only two thingsteads where superhuman beings deliberate and judge—namely, the Thing in Asgard and the Thing near Urd's fountain—and inasmuch as it is, in fact, only in the latter that the gods act as judges, we are driven by all the evidences to the conclusion that Sigrdrifumal has described to us that very thingstead at which Hvedrung's kinswoman summoned King Halfdan to appear after death.
Sigrdrifumal, using the expression á thvi, sharply distinguished this thingstead or court from all others. The poem declares that it means that Thing where hosts of people go into full judgments. "Full" are those judgments against which no formal or real protests can be made—decisions which are irrevocably valid. The only kind of judgments of which the mythology speaks in this manner, that is, characterises as judgments that "never die," are those "over each one dead."
This brings us to the well-known and frequently-quoted strophes in Havamál:
Str. 76.