Greek Fire Projectiles is a unique technology in Age of Empires IV: The Sultans Ascend available to the Byzantines that can be researched in the Imperial Age. It increases the damage dealt by Counterweight Trebuchets and Mercenary Huihui Pao by +30%, and enables their projectile impact to engulf their target with lingering Greek Fire, dealing area damage. This technology replaces Geometry for the Byzantines.
When researched at a Siege Workshop within the influence of a Cistern with the Dialecticus ability active, the research speed of this technology is 30% faster per water level at the Cistern.