Phononmaser, or Phononmezer (Japanese: ) is a recurring weapon or attack in the Phantasy Star series.
Phantasy Star IVIn Phantasy Star IV: The End of the Millennium, the Phononmaser (called Phononmezer), abbreviated Phonon, is a skill used by Demi in Phantasy Star IV: The End of the Millennium. It deals sonic damage to all enemies equal to 176 plus Demi's strength stat, modified by each enemy's physical sensitivity and defense stat. Some monsters, including Slugs, Scorpions and Zombies are resistant to sonic damage; Ghosts, Dimensional Demons, and some bosses are also immune.
Phononmezer can be combined with Chaz's Air Slash skill in any order to do a Silent Wave combo.
Demi can use Phononmezer after it is found in the Plate System.