Necrochasm

"Eternity is very close. Can you feel yourself slipping?"

- Weapon description

Necrochasm is an exotic auto rifle in Destiny added by The Dark Below. It requires obtaining the Common Auto Rifle Husk of the Pit; upgrading it to the Legendary Auto rifle Eidolon Ally; and upgrading that to Necrochasm with a Crux of Crota rewarded from completing Crota's End on Hard Mode, or with the essence of the Oversoul from completing the 390 Light version of Crota's End.

Like Thorn, Necrochasm is one of the Weapons of Sorrow. It was created from a captured Guardian weapon (likely taken after the Great Disaster) and modified by the Hive to feed on its owner's aggression.

Year 3
In Year 3, the Husk of the Pit can be obtained via killing any Hive Ogre, although the drop is not guaranteed. The weapon is then upgraded to Eidolon Ally through killing a certain amount of a randomly rolled Hive enemy. After the Husk has been upgraded, the player must then kill Omnigul, Will of Crota and then obtain the Essence of the Oversoul from killing Crota in the 390 version of Crota's End. Once those two tasks are complete, the gun can then be upgraded into Necrochasm.

Gameplay
Necrochasm's signature ability is "Cursebringer", which allow the player's kills with the weapon to trigger Cursed Thrall-esque explosions.

Lore (D2)
Arise for Crota, Son of Oryx, the Hope-Eater!

He who has seized the Sky lair above Ceres, which peers into other planes, now vassal to the might of the Worldbreaker!

Within these keyholes our brood communes with unheard voices. They who whisper that the curse of our Thralls is a blessing granted by the Deep.

Now, in honor of the God-Knight, we fashion these gluttonous whispers into death. His Hellmouth becomes home to the profane: the corpse of the Sky, reborn in the abyss.

— Enkaar, the Anointed

Trivia

 * Necrochasm is the only weapon in Destiny that is acquired by upgrading it from common (Husk of the Pit) to legendary (Eidolon Ally) to exotic (Necrochasm) status.
 * The weapon was referenced in the credits of The Simpsons episode Treehouse of Horror XXVI.
 * In Year 3, Necrochasm is the only Exotic weapon in Destiny other than the Zhalo Supercell that has an elemental burn and requires a player to complete a part of a raid.

List of appearances

 * Destiny
 * Destiny 2
 * Season of the Witch