If you have been running a Necro and love the feeling of detonating half the screen at once, then you have probably heard of Black River. It is the kind of weapon that makes Corpse Explosion go from “pretty good” to “holy hell, did you see that?” The first time you use it, you will get why people chase it. For anyone stacking a Shadowmancer setup or leaning into the Blighted Corpse Explosion, this thing is pure chaos in the best way. You pop one corpse, and suddenly the whole pack is gone. It is one of those Diablo 4 Items that feels like it changes the way you play entirely.

What makes it so nuts is the unique effect. Black River lets Corpse Explosion eat up to four extra corpses near the one you target. Each extra corpse means more damage and a bigger blast radius. So instead of a small pop, you get this massive chain reaction. It is like setting off a single stick of dynamite and finding out it was wired to a whole warehouse. The more bodies lying around, the bigger the mess you make. In high-density fights, it is almost unfair how quickly things melt.

Now, getting one is the tricky part. Like other uniques, it drops randomly, so you cannot just farm a single dungeon and expect it to appear. You will need to be in World Tier 3 or 4, because it will not drop in lower tiers. If you are aiming straight for it, Lord Zir is your guy. He has a better chance than most bosses to drop unique scythes. Summoning him takes some work, though—you will need Exquisite Blood, which drops from Legion Events or World Bosses in World Tier 4. It is a grind, but it is the most direct route if you are serious about getting it.

If Lord Zir feels out of reach, there are still solid options. High-tier Nightmare Dungeons are great because of the elite density. Helltide events can be gold mines—make sure you open the big Tortured Gift chests when you can. Whispering Tree caches are also worth hitting, since they can drop some choice loot. The key is killing as many elites as possible, as fast as possible, to keep those drop chances rolling.

Once you finally get Black River, you will see why people swear by it. It is not just about damage—it is the way it changes the rhythm of combat. You stop thinking about single targets and start looking for spots to set off huge chain blasts. For anyone who loves turning the battlefield into a graveyard, it is right up there with the best diablo 4 buy items you can find.