Doombringer is a Unique Sword. It can be used by any class.
The Doombringer, now classified as a 
Mythic item in Diablo 4's latest update, is a powerful sword that excels in both defensive and offensive capabilities. What sets this weapon apart is its significant boost to all stats, offering a substantial 35% increase in maximum life, 10% damage reduction, and a unique shadow damage effect that reduces enemy damage by 20%. This makes the Doombringer not just a defensive powerhouse but also a strategic offensive tool, particularly effective for builds that rely on maximizing life and fortify, like overpower-focused or thorns-based characters.
The sword's ability to deal shadow damage also adds versatility, allowing it to synergize with various non-physical damage builds across multiple classes. Despite its impressive stats and effects, the Doombringer may not fit into every build due to weapon-specific requirements in certain playstyles. However, for those who can incorporate it, this weapon transforms its wielder into a formidable tank with potent offensive potential.
Effect
Lucky Hit: Up to a 40% chance to deal X Shadow damage to surrounding enemies and reduce their damage dealt by 25% for 5 seconds.
How to get Doombringer
You can farm this unique from 
Duriel, Maggot King
Andariel, Maiden of Anguish
Whenever this ancient sword has reappeared throughout history, it portends a time of great strife, as well as a devastating loss of life.
Legions
Helltide