Lex belongs to relatively new kind of light dragons, officially still qualified as courier, but commonly referred as „chasers” or „racing” because of lower mass and extraordinary flight speed. Changes of nomenclature, not welcomed by researchers, are motivated by the advances in technology. Importance of dragon couriers decreases since the invention of the the telegraph and in 21st century it's very unlikely to find any, who still would do traditional work on territory bigger than a city.

The development of breed was started between 18th and 19th century, when the „fashion of dragons” motivated elites to own at least single creature and because of difficulties, costs and, in some cases, distaste to enormous beasts among nobles, favoured choice of smaller breeds. Another factor was decreasing need for dragons in modern armies and their raising independence, so it was easier to make living for lighter types.

Modern „racers” are even smaller than theirs courier ancestry and most of them are smarter. Most noble lineages are proud of beautiful, reaching shoulders, manes and brushes on tails. Durable but thin like paper membranes are source of pride to any specimen. Specific geometry of wings with membrane supported on set of spikes (from 1 to 4 on lumbar spine) gives them great manoeuvrability and speed by cost of short range. They easily get tired at longer distances.

Inbreed at the beginning of the brood caused, despise of peaceful progenitors, there are many of specimen prone to fall into fury. Angry racer isn't too dangerous for heavier dragon, but can be threat for humans around him. Another problem of this breed are problems with wings. From bones, through joints to the structure of transparent membranes, which microdamages may cause limiting flight characteristics and eventually grounding a dragon.

In society chasers have found respected niches, devoting themselves to most impressive variety of sports, serve in police forces, VIP security or as personal transport, on contracts or as „flying taxi”. Not everyone can afford services like that, but it's more comfortable than get stuck in a traffic jam (unless you have a fear of heights).