Caged Hearts are the most important items in Diablo 4 Season 1, and to Diablo 4 gold earn them as fast as possible, you need to grind through some Malignant Tunnels. In my guide, I’ll outline where you can find the tunnels and how they work in the Season of Malignant.

How to Find Malignant Tunnels in Diablo 4
Malignant Tunnels can be found in areas like the Dindai Flats of the Dry Steppes or The Pallid Glade in Fractured Peaks. These tunnels will spawn all around Sanctuary and they have a similar icon to the standard Dungeons that we’ve all been grinding since release. However, there are some easy identifiers for the tunnels.

The Season 1 story will automatically take you to some of these Malignant Tunnels, including places like the Ravening Pit in the Dry Steppes. But far more will appear around the overall Sanctuary map that allows you to farm to your Caged Heart’s content.

What are Malignant Tunnels in Diablo 4 Season 1?
In essence, the Malignant Tunnels are just seasonal Dungeons that allow you to grind for Caged Hearts. Each tunnel will have a specific color that places it under one of the Caged Heart categories. Some tunnels will be marked as Brutal, while others may be called Vicious or Devious.

Diablo 4’s first Season, Season of the Malignant, is now in full swing. A strange plague has descended upon Sanctuary, infecting demons to make them more infested, but also far more powerful. Needless to say, you and Cormund have some work to do to clear out the threat. Before you can start digging into the content though, you’ll need to get a Seasonal character going. Here’s how to cheap Diablo 4 gold create a Seasonal character in Diablo 4.