Grapered Lances is a campaign-exclusive technology in Age of Empires IV that can be researched at the Blacksmith in the Imperial Age. It increases the charge damage of Knights and Lancers by 12. It is available in all four original campaigns, but was removed in all other game modes.
The Mongols can research the improved version of the technology for an additional 675 stone. It further increases the charge damage of Lancers by +6 (+18 total)