History of Tempered Edge

Tempered Edge is a blade perk on Swords. Its in-game description reads "Increased sword damage and ammo." It is one of the two blade options on Honor's Edge, alongside Jagged Edge, which trades ammo for more damage; the sword's guard options are Burst Guard and Enduring Guard.

Where it appears

Honor's Edge, a Legendary sword listed as Season 10 on the D2 Wiki. Destinypedia says it was a Faction Rally reward from New Monarchy; the D2 Wiki lists engram, faction rank-up, Dares of Eternity and Xûr sources, so the two sources differ on how it is acquired.