The infernal orders of Talan dwell in Bolverk, a megacity on the plane of Abyss. The city is partitioned: seven independent spires for the Vice Demons on one side, a tetradecagram of fourteen vertically-split ziggurats around a central Council Hall for the Virtue Devils on the other. Between them runs the Tunsund: a channel that floods on a daily cycle tied to the moons sinking into the Cloud Sea, carrying freshly-judged souls from Dauria (the Judgment City in Diyu) onto four-terraced neutral banks. There, demons and devils contest, claim, or trade the new arrivals.

Bolverk is the endpoint of corruption, not the engine. The work of vice and virtue-corruption happens on Talan via whispers, offers, and bargains; Bolverk is where the harvested souls are processed into Wellspring-power. Most residents are nominally pledged to a Vice Demon or a Virtue Devil (a tithe of their Wellspring flows up), but live independently day-to-day, like medieval kingdom subjects. A smaller third estate of Independents (and the Soul Sellers, an infernal merchant class) walks the streets unclaimed.

The Vice Demons of Talan embody one of the seven canonical Vices directly. Unlike the Virtue Devils (which embody a corruption of something good), Vice Demons are the vice itself given form, pure embodiment, not parasitism. There are always seven, and there is always one per Vice. The seats are immortal (as long as the vice exists in mortals); the holders can be killed and replaced. Power moves below the seven by clawing climbers; the seven themselves rarely shift.

The Virtue Devils of Talan follow a coherent theological pattern that mortal scholars have catalogued: each Virtue Devil is the personification of a virtue's corruption. Following the classical doctrine of the mean, every virtue sits between two failure modes, one of excess, one of deficiency. A Virtue Devil embodies both extremes within itself: the corruption of the virtue as a whole, manifested as either excess or deficiency depending on what will most damage the mortal in their grip. The devil tips the scale; they do not care which way it falls.

Fourteen Virtue Devils, one per virtue. Each owns a vertically-split ziggurat in the tetradecagram: the excess-face as the upper tier, the deficiency-face as the lower tier, the devil itself seated on the false-mean between (looking, from a distance, like virtue). The 14 devils sit on the Council of Fourteen in the central Council Hall, by consensus-bound debate (slow, ritualistic, mostly stable). The contrast with the anarchic Vice Demon spires across the Tunsund is precisely the point.

A devil's preferred mode (which extreme they push toward first) varies by individual. The Courage Devil may default to feeding Cowardice in some mortals and Recklessness in others; they read the target and tip whichever way will damage more. Scholars who study a particular devil can sometimes anticipate; the devil can also flip. A handful of Enki-aligned exorcists work by reading the devil, identifying its virtue line, then deploying the true mean (the genuine virtue itself) to push it off-pattern. The corruption fails not when the opposite extreme is invoked but when the virtue is restored.