Hyperdense Iridium Rounds

Use when firing a Rail-type weapon.

Measure an imaginary line (< 1 mm wide) from the
user’s base to the target’s base, with the line
extending all the way up to the weapons maximum
firing range. In addition to the primary target, each
model that this line passes through (including friendly models) suffers an attack from, those weapon with
a -1 to hit for each model that lies before it on the imaginary line (to a minimum of 6+).