Ripstream is a strong wind that limits the height of javelin propulsion.
Overview[]
Though Arcanists have long studied the buffeting winds in upper atmosphere of the world, there has been little agreement on or proof of their cause. In the early 200s, there was a popular belief that the Shapers wished to keep creatures limited to a certain area, as if remaining close to the ground was part of a larger plan. Less suspicious minds believe the ripstream is due to the size of the moon (world) and atmospheric variables.
Ripstream can also be experienced when "one leaps from a cliff, only to enter a vague greyness, then arrive suddenly near where one started".