The Lightweavers' Guild

The foundation of the great skyship age of Aerolithica was the rise of the Lightweavers. In the wake of the Great Sundering, the skies were filled with a great borealis - The Iridescence - beautiful and random. But individuals were born with the innate ability to trace the arcane patterns in the very weave of The Iridescence, allowing it to guide them across vast distances. These individuals were known as Lightweavers, and each vessel - both Skyship and seafaring - requires one in their crew in order to operate. Most Lightweavers are arcane practioners, but some have no magical capabilities beyond their ability to interpret The Iridescence.
While there are many hundreds of Lightweavers across the Realms, the most gifted often find themselves inducted into the Lightweavers' Guild. As well as the guarantee of employement, members of the Guild are always the first choice for voyages chartered by the wealthy or political elite.