The farthest and smallest (at least to the eye) of the moons in Adnati's skies is Caerudraal. It is often called the “Blue Moon” because of its light blue appearance. Sages debate whether the moon is covered by oceans, or if the color comes from minerals in its soil, or if is perhaps a giant gemstone, like a sapphire.
The Caerudraal cycle takes a full 77 days to complete from new to full and back to new. There are usually five full Caerudraal moons per year, but roughly every third year (about 30% of the time), there are only four full moons in the calendar year.
Lunaal and Caerudraal are both simultaneously full every 2,230 days, which works out to about once every six years. (Specifically, every 6.17 years.) Tides may be slightly higher and storms slightly stronger, but not nearly to the same degree as when Lunaal and Raudraal are both full.
Both Caerudraal and Raudraal are full simultaneously only once every 3,080 days, or eight and a half years (specifically, 8.51 years). There are no known geophysical effects of this phenomenon, though many cultures celebrate the rare occurrence.
Many people, save for the long-lived elves, can go their entire lives without Lunaal, Raudraal, and Caerudraal all being full at the same time. Humans can go many generations without it happening, as it only occurs once every 89,320 days, or about 247 years. (Specifically, every 246.74 years.)
When this occurs, tides can get very high and epic storms are virtually inevitable somewhere on Adnati. Lycanthropes invariably turn, even if they generally have full control over their shapeshifting. It is said that women who conceive during one of these storms, or deliver a baby during one, will inevitably give birth to a child who can be a sorcerer or at least can pass down that ability in their blood to some of their descendants.