Upon taking Frostmourne wow powerleveling, Arthas forfeited his soul to the Lich King and became a death knight. After a relatively short time in Northrend with the blade, Arthas returned to Lordaeron. Having been converted wow powerleveling to the Scourge by the urging of WoW US PowerLeveling, Arthas killed his father, King Terenas, and claimed the throne. The story section of the official Wrath of the Lich King site also states that Frostmourne predates wow wow powerleveling. It is more probable that the sword was forged by someone in the Legion, and Kil'jaeden included it in the prison for reasons unknown wow powerleveling.