In the same manner as Sol is called Dvalin's leika, so the son of Nat and Delling, Dag, is called leikr Dvalins, the lad or youth with whom Dvalin amused himself (Fornspjal., 24).
We have here found two points of contact between the mythic characters Dvalin and Delling. Dag, who is Dvalin's leikr, is Delling's son. Delling is the watchman of the castle of the ásmegir, which Dvalin's artists decorated.
Thus the whole group of persons among whom Dvalin is placed—Mimer, who is his teacher; Sol, who is his leika; Dag, who is his leikr; Nat, who is the mother of his leikr; Delling, who is the father of his leikr—have their dwellings in Mimer's domain, and belong to the subterranean class of the numina of Teutonic mythology.
From regions situated below Midgard's horizon, Nat, Sol, and Dag draw their chariots upon the heavens. On the eastern border of the lower world is the point of departure for their regular journeys over the heavens of the upper world ("the upper heavens," upphiminn—Völuspa, 3; Vafthr., 20, and elsewhere; uppheimr—Alvm., 13). Nat has her home and, as shall be shown hereafter, her birthplace in dales beneath the ash Ygdrasil. There she takes her rest after the circuit of her journey has been completed. In the lower world Sol and Nat's son, Dag, also have their halls where they take their rest. But where Delling's wife and son have their dwellings there we should also look for Delling's own abode. As the husband of Nat and the father of Dag, Delling occupies the same place among the divinities of nature as the dawn and the glow of sunrise among the phenomena of nature. And outside the doors of Delling, the king of dawn, mythology has also located the dwarf thjódreyrir ("he who moves the people"), who sings songs of awakening and blessing upon the world: "power to the Asas, success to the elves, wisdom to Hroptatyr" (afl asom, enn alfum frama, hyggio Hroptaty—Havam., 160).
Unlike his kinsmen, Nat, Dag, and Sol, Delling has no duty which requires him to be absent from home a part of the day. The dawn is merely a reflection of Midgard's eastern horizon from Delling's subterranean dwelling. It can be seen only when Nat leaves the upper heaven and before Dag and Sol have come forward, and it makes no journey around the world. From a mythological standpoint it would therefore be possible to entrust the keeping of the castle of the ásmegir to the elf of dawn. The sunset-glow has another genius, Billing, and he, too, is a creation of Modsogner, if the dwarf-list is correct (Völuspa, 12). Sol, who on her way is pursued by two giant monsters in wolf-guise, is secure when she comes to her forest of the Varns behind the western horizon (til varna vidar—Grimn., 30). There in western halls (Vegtamskv., 11) dwells Billing, the chief of the Varns (Billing veold Vernum—Cod. Exon., 320). There rests his daughter Rind bright as the sun on her bed, and his body-guard keeps watch with kindled lights and burning torches (Havam., 100). Thus Billing is the watchman of the western boundary of Mimer's domain, Delling of the eastern.
From this it follows:
That the citadel of the ásmegir is situated in Mimer's lower world, and there in the regions of the elf of dawn.
That Svipdag, who has seen the citadel of the ásmegir, has made a journey in the lower world before he found Menglad and secured her as his wife.
The conclusion to which we have arrived in regard to the subterranean situation of the citadel is entirely confirmed by the other passage in the poetic Edda, where the ásmegir are mentioned by this name. Here we have an opportunity of taking a look within their castle, and of seeing the hall decorated with lavish splendour for the reception of an expected guest.
Vegtamskvida tells us that Odin, being alarmed in regard to the fate of his son Balder, made a journey to the lower world for the purpose of learning from a vala what foreboded his favourite son. When Odin had rode through Nifelhel and come to green pastures (foldvegr), he found there below a hall decorated for festivity, and he asks the prophetess: