Grand Conflux
The Grand Conflux is Arcanthys’s reality-warping defensive apparatus — the magical phenomenon, not the physical building, that the city unleashed against Aurelia’s Nullstone Constructs during the War of Fractured Heavens (582-589 A.I.). World-brief canon. The Conflux works by warping reality itself to trap battalions in mirrored illusions and shifting streets, redirecting any incursion onto itself rather than meeting it head-on. Its physical anchor and projection-point is the Grand Conflux Spire at the centre of the city; its institutional custodian is Archmagister Vylarine Thael. The Conflux is the campaign’s canonical example of a reality-bending working at city-scale, and the magical half of the standing Aurelia/Arcanthys cold peace.
Lede
The Grand Conflux is the magical apparatus that gives Arcanthys its city-scale reality-warping defence. The world brief is careful to distinguish two adjacent terms:
- The Grand Conflux Spire is the physical tower — the colossal crystal-and-adamantine nexus at the city’s centre that anchors the floating platforms and contains the apparatus.
- The Grand Conflux is the magical phenomenon itself — the reality-warping working the Spire focuses and projects.
This article documents the latter. For the former, see the Grand Conflux Spire page.
The Conflux is the campaign’s canonical example of an arcane working at the scale of an entire city, and the magical half of the standing Aurelia/Arcanthys cold peace.
What it does
The world brief documents two named effects of a Conflux deployment, both observed in the War of Fractured Heavens:
- It traps entire battalions in mirrored illusions — large-scale illusory environments that swallow a force at the formation level.
- It causes shifting streets — the literal geography of Arcanthys reconfigures around any invading force, sending them in circles, away from objectives, or back out into the city’s defended approaches.
In combination, the brief describes the working as warping reality itself. The effect is qualitatively different from ordinary battlefield illusion or large-scale enchantment: it operates at the level of the city’s physical street-grid, not at the level of any one perception.
The brief does not enumerate exactly what other working modes the Conflux can sustain, what the cost of operating it at full intensity is, or what the upper limit of its effective radius might be. The implication is that the working is bounded by the Spire’s structural anchor — i.e., the Conflux at full intensity is what was unleashed against the Nullstone Constructs, and that was the historical maximum.
Custodianship
The Conflux is under the personal custodianship of Archmagister Vylarine Thael, ruler of Arcanthys. The world brief is explicit on the title: she is “custodian of the Grand Conflux”, the institutional binding between the city’s chief office-holder and its signature apparatus. Whether the custodianship is a single office passed between Archmagisters or whether Vylarine has held it for longer than is mortally usual is open. The brief does note her obsession with transcending mortality to become a being of pure arcane essence — a project that, given her custodianship of the apparatus, may have direct bearing on the Conflux’s continued development.
Deployment history: the War of Fractured Heavens
The only named historical deployment of the Conflux is the War of Fractured Heavens (582-589 A.I.), in which Aurelia sent its Nullstone Constructs into Arcanthys. The Constructs were forged from black-veined Nullstone that suppresses magic and proved immune to spells and unstoppable by force alone; Arcanthys responded by unleashing the Grand Conflux, which trapped entire battalions in mirrored illusions and shifting streets.
The deployment ended in stalemate:
- Aurelia’s Constructs were embedded in Arcanthys’s floating-city infrastructure; destroying them risked collapsing the city’s platforms (see Nullstone Constructs).
- The Conflux had stopped the invasion but could not eject the Constructs without the same risk.
The result is the standing two-century peace between the two powers, and the underlying canon for the DM’s s14 framing that Arcanthys arcane casters are the one tolerated exception to Aurelia’s anti-magic regime [2].
No second deployment of the Conflux at this scale is recorded in the brief.
Implications
The Conflux is the campaign’s canonical demonstration that a city-scale reality-warping working is possible in Eldurae. It is also a structural reminder that the cost of such a working is constrained — Arcanthys did not press its advantage after stalemating Aurelia; the brief does not describe any further use of the apparatus in the two centuries since.
The Conflux is dormant in the present timeline. Whether it could be unleashed again, at what cost, and against what target are open questions. The party has not been close to it.