Subtlety

Subtlety makes the player more elusive and less likely to be tracked or hunted. Opposite to Hunting, it can make the player adept at camouflaging themselves and concealing their presence from enemies. These players are predatory, rogue-like, and are often Assassins or Bounty Hunters, much like Hunters, but kill their prey in a different style. They rely on deception and attacking vital points to execute critical strikes. However, some players may opt for a mixture of Subtlety and Hunting.

As well as making excellent predators, they are also good scouts and will be sought after for their ability to get information from places that other players may not be able to go without being attacked or killed. In this sense, they are invaluable.

Leveling Weights
These are actions that when performed frequently grant experience to their corresponding skill. If all of the weight requirements are not met, the player cannot achieve max-level or Mastery in that particular skill. Here's a list of every skill's Leveling Weights.