Catha

Catha is the larger and closer of Exandria's two moons, considered the primary moon. The phrase "lunar cycle" commonly refers to Catha's cycles. It is associated with Sehanine, the Moon Weaver.

Description
Catha appears either pale blue or bright white in the sky, resembling Earth's moon, though Catha is a little closer than the moon is to Earth and so appears larger in Exandria's sky. It takes between 30 to 40 days to orbit Exandria, during which it waxes and wanes; this is the commonly referred to lunar cycle.

Study and mythology
Catha is linked to Sehanine, the Moon Weaver, who is believed by some to have created it to watch over the just and to cloak those who need to be hidden. Elven astronomers track its lunar cycles to predict the largest full moon of the decade, on which Sehanine's holy day is celebrated.

Its lunar cycles are also sometimes connected to other beings, including possibly demons, and with various curses; lycanthropy is affected by Catha rather than Ruidus. Some worry that rare double eclipses, where Catha and Ruidus simultaneously overlap the sun, cause the Material Plane and other planes to calamitously intersect.