THE OFFICIAL ARCHIVE
Blue Moon
One of the two lunar bodies in Prade's sky. Its blue light allows the Eyvas to manifest physically.
Overview
The blue moon is one of two lunar bodies observed from Prade, alongside a white moon. Its blue light shapes life across the kingdoms, as it determines whether the Eyvas can become visible and tangible.
The observations recorded here mainly concern Beryl, where its periods of presence in the sky and absence recur in an approximate pattern.
Appearance and Characteristics
The blue moon differs from Prade's other moon through its bluish hue. When its light reaches the night landscape, its presence is especially important to inhabitants of regions affected by Eyva appearances.
Its color and periods of visibility do not by themselves establish its composition or physical structure; these details are not yet fixed in the encyclopedia.
Visibility Cycle in Beryl
From Beryl, an apparent cycle of roughly 21 Prade days is observed. The blue moon remains visible for about 7 days and is absent from the region's sky for the following 14. Another period of visibility then begins.
Prade days last 26 Earth hours; thus, 21 days correspond to approximately 546 Earth hours. This conversion describes the observed cycle, not a confirmed measurement of the moon's orbit.
Phases and Observable Periods
Beryl's calendar distinguishes two practical periods: presence and absence. This classification should not be confused with traditional astronomical phases—new, waxing, full and waning—which have not yet been defined for the blue moon.
Absence means that the moon cannot be observed from the region during that interval. It does not imply that the moon has ceased to exist. The exact patterns from other continents have not yet been established.
Size, Distance and Orbit
The blue moon's diameter, orbital distance from Prade and apparent size relative to the white moon have not yet been established. Consequently, the encyclopedia does not give invented kilometer measurements or an exact size ratio between the two bodies.
The astronomical explanation for the regional cycle of 7 visible days and 14 absent days also remains open. Future maps and astronomical records can expand this section once those values are established.
Connection with the Eyvas
The most significant consequence of its light is the manifestation of the Eyvas. These entities become physically substantial and able to attack when reached by blue moonlight; without it they remain invisible and intangible.
That is why enclosed shelters, shadows and obstacles that block the light matter. The white moon does not reproduce this effect: what matters is whether blue moonlight actually reaches an Eyva.
Importance to Prade's Inhabitants
Travel, expeditions and settlement security can depend on the lunar period. In Beryl, the 14 days without the blue moon provide a particularly valuable window for reducing the risks associated with Eyvas.
The moon's absence does not eliminate the world's other dangers, but it strongly influences the decisions of those who must cross roads or seas.
See Also
A spoiler-free encyclopedia entry.
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