The subject can hurl rocks up to two categories smaller than its own size. The range increment for this attack is 20 feet, and rocks can be hurled a maximum of 5 range increments. Damage is based on the size of the subject—1d8 points of damage for a Large creature, 1d6 for a Medium creature, or 1d4 for a Small creature—plus 1-1/2 times the thrower’s Strength bonus.
For every size category smaller than Large the subject is, it receives a cumulative –5 penalty on Reflex saves to catch rocks (or similar projectiles) thrown at it.
Pathfinder Player Companion: Giant Hunter’s Handbook © 2014, Paizo Inc.; Authors: Alexander Augunas, Luis Loza, Ron Lundeen, and David Ross.