Price 70 gp; Type exotic
An alchemically fired piston in the head of this two-handed hammer strikes targets with astounding force. Successful sunder attacks made with a piston maul deal an additional 4 points of damage. A piston maul requires a thunderstone to function; otherwise, it functions as a greatclub. Inserting a thunderstone into the weapon’s compartment is a standard action, and powers the weapon for 24 hours, after which the thunderstone is consumed.
Pathfinder Player Companion: Adventurer’s Armory 2 © 2017, Paizo Inc.; Authors: Jenny Jarzabski, Mikko Kallio, Isabelle Lee, Luis Loza, Joe Pasini, David N. Ross, and Linda Zayas-Palmer.