In Diablo IV Season 1, killing monsters and completing objectives in dungeons to grind loot is still the focus of the game. Here we’ll show you the locations of all Malignant Tunnels and the best Malignant Tunnel to farm in Diablo 4, with objectives you need to complete. 

What are Malignant Tunnels in Diablo IV and Where to Find Them?

In the D4 Season 1, also known as Season of the Malignant, players are able to access the Malignant Tunnels, which are basically dungeons that have a higher rate of spawning Malignant versions of elites. When you defeat a Malignant monster, it drops a Malignant Heart. At the end of the tunnel, there is a malignant overgrowth, you can use a specific type of invoker of your choosing to spawn a malignant monster of the matching type, which can drop a caged heart of that type when you defeat the monster. 

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List of D4 Malignant Tunnels & Locations

There is a total of six Malignant Tunnels throughout the Sanctuary, they are marked with the same icons as dungeons on the map, but with a great leaf. To find each Malignant Tunnel, below are the locations. 

- Fissure of Malice: Frostbite Trails, in the southwestern area of The Pallide Glade (Fracture Peaks region).

- The Boiling Wound: Shivering Wilds, in the southeastern area of the Frigid Expanse (Fractured Peaks region).

- Den of the Blighted: southern paths of the Path of Desperation, at the southern area of the Dismal Foothills (Hawezar region).

- Bedeviled Grotto: Blackguard Bog, in the central area of the Forsaken Coast (Hawezar region).

- Dindai Hollow: northern parts of the Forlorn Tread, in the western area of Dindai Flats (Dry Steppes region).

- Ravening Pit: Desolation's Reach, in the eastern area of the Untamed Scarps (Dry Steppes region).

D4 Best Malignant Tunnels - Best Malignant Tunnel to Farm in Diablo 4

Malignant Tunnels are where people can farm any Invoker and Heart, do they good for Diablo IV items and XP farming? And which one is the best Malignant Tunnel to farm in D4?

1. The Boiling Wound

If you want to farm more Caged Hearts, the Boiling Wound would be the best malignant tunnel, because you need to interact with the Outgrowth waiting at the end of the tunnel, this tunnel has the shortest layout and fewer objectives to reach the Outgrowth, take your Malignant Invokers to interact with the Outgrowths and kill the elite enemy spawn there, you’ll get a drop of Malignant Heart, which can be captured for a strong Caged Heart of the corresponding type. This tunnel requires a Devious Malignant Invoker, and elite enemies that drop Malignant Hearts including Irk'aq Blightcall, Szaqilrai Bilespew, and Zraarzur Blinkswift.

Objectives:

Destroy the Malignant Corruption 0/3

Slay Vorna, Malignant Werewolf

Capture the Malignant Heart (Optional) 

2. Dindai Hollow 

While if you want to level up your character in Season 1 of Diablo IV in the fastest way, Dindai Hollow should be the best option to pick, compared to other tunnels, it has an obviously higher efficiency of XP farm, which makes it ideal for quick leveling. It has a good layout and great mob density. You can farm a specific amount of XP to get the notification of completion, and then go out to reset it, and do it one more time. 

Objectives:

Slay all enemies in the Infected Warrens

Slay Arandok, Malignant Warchief

Capture the Malignant Heart (Optional)