From Destinypedia, the Destiny wiki
Black Hammer is a Legendary Year 1 Sniper Rifle that deals Solar damage and is rewarded from defeating Crota, Son of Oryx in the Crota's End Raid. The weapon was also remade both in Year 2 of Destiny as an exotic called Black Spindle and as an Exotic in Destiny 2 known as Whisper of the Worm. Black Hammer is also one of only a select few sniper rifles to possess an extremely high impact. The weapon and its iterations are well known for their uses against bosses and Major enemies.