Non-ballistic shells

  Xenium is a magical metal found only on Kulthea which has the property of negating gravity. The skyships of Eidolon employ broad plates of Xenium under their hulls to enable their means of travel.
  Ballistic motion, as from a projectile weapon, is governed by the force of gravity. However, if the projectile is completely coated with Xenium it becomes substantially immune to the effects of gravity (unavoidable deformation of the Xenium due to the explosion of the propellant make it slightly susceptible to gravity). Thus, air friction becomes the primary force acting on the projectile, and its range is far greater than usual.
  These non-ballistic projectiles have five times normal range for their weapon type. They fly straight from the point of their launch, dropping in velocity due to friction until they settle slowly to the ground. To represent this in game terms the penalty for long range is doubled and extreme range is tripled. For example, if a weapon's normal characteristics are:
point blank 1'-10' +10
short 11'-55' 0
medium 56'-110' -25
long 111'-300' -50
extreme 301'-400' -100

then when firing non-ballistic shells its range characteristics will be:
point blank 1'-50' +10
short 51'-275' 0
medium 276'-550' -25
long 551'-1500' -100
extreme 1501'-2000' -300

Non Ballistic Shells Defy Gravity

Weight: weightless

Spells used: ritual forging
Time to enchant: 1 day/shell