How Arthas's Hammer Was Turned Into Shadowmourne - Warcraft Lore
Light's Vengeance was the hammer used by during his life as a paladin.
Light's Vengeance on the ground in front of
Light's Vengeance was an enormous, heavy-looking hammer, its silver head etched with runes and its sturdy haft wrapped in blue leather.
It was given to Arthas by  Gavinrad the Dire when Arthas completed a ceremony held in the Cathedral of Light and joined the Knights of the Silver Hand.
When he took up
Frostmourne, Arthas discarded Light's Vengeance, leaving it in Frostmourne Cavern in the Dragonblight. Players can see a flashback of this scene in the quest  .
The Sacred and the Corrupt wants adventurers to collect Light's Vengeance for the quest Darion Mograine  . He wishes to create an artifact to rival Frostmourne, and believes only the hammer of Arthas himself will provide a worthy model. The Sacred and the Corrupt
When reforged with
saronite, Light's Vengeance is transformed into Shadow's Edge, the unfinished form of Shadowmourne.
Light's Vengeance in Warcraft III
In World of Warcraft, Light's Vengeance shares its model with the
[Grand Marshal's Battle Hammer ]