Learn how to find Brutal Overgrowths in Diablo IV Season 1. Discover Malignant Tunnels, identify Overgrowths, and craft Invokers to obtain powerful Malignant Hearts.
Malignant Tunnels are special dungeons marked with a green symbol on the world map, appearing as small green dots when zoomed out. Inside these tunnels, you'll find isolated rooms containing Malignant messes with two tumor-like growths. These growths can yield different types of Malignant Hearts.
For the Brutal Overgrowth quest, you need to locate growths specifically marked in a ghostly blue color. To interact with these Overgrowths, you must possess the appropriate Invoker item. These Invokers can be crafted at the new Malignant Research benches found in all major cities.
Once you have the Brutal Overgrowth Invoker, you can interact with the Brutal Overgrowth. This will spawn enemies that you must defeat. Upon victory, you can collect a caged heart corresponding to the Overgrowth's type. Activating a Brutal Overgrowth can yield the following Malignant Hearts:
| Malignant Heart | Type | Effect | Class |
| The Lionheart | Brutal | Defensive: You gain 10% Barrier Generation. You Heal 3-7 Life per second while you have an active Barrier. | All |
| Revenge | Brutal | Defensive-World Tier III: 10-20% of incoming damage is instead suppressed. When you use a Defensive, Subterfuge or a Macabre skill, all suppressed damage is amplified by 250% and explodes, dealing up to 1360-2040 Fire damage to Nearby enemies. | All |
| Prudent Heart | Brutal | Defensive-World Tier III: You become Immune for 2.0-4.0 seconds after you lose more than 20% Life in a single hit. This effect can only occur once every 110 seconds. | All |
| Resurgent Life | Brutal | Defensive: While below 40-60% Life, you receive 50-60% more Healing from all sources. | Barbarian |
| The Agitated Winds | Brutal | Defensive: When 8-13 Close enemies, automatically cast Cyclone Armor. This cannot occur more than once every 10-20 seconds. | Druid |
| The Decrepit Aura | Brutal | Defensive: When at least 5 enemies are near you, gain an aura that automatically curses surrounding enemies with Decrepify for 5-15 seconds. | Necromancer |
| Trickery | Brutal | Defensive: When you use a Subterfuge Skill, leave behind an unstable Shadow Decoy Trap that Taunts enemies. The Shadow Decoy Trap will explode after 6.0 seconds dealing 680-1020 Shadow damage. Cannot occur more than once every 5 seconds. | Rogue |
| Spellbreaking | Brutal | Defensive: After taking Elemental damage, gain 20-40% Resistance to that element for 5 seconds. | Sorcerer |
The same principle applies to other Malignant Heart types. For example, activating a Vicious Overgrowth requires a Vicious Invoker and yields a random Vicious Invoker reward. The same applies to Wrathful and Devious Overgrowths. Consulting a Diablo 4 Malignant Heart List can help you identify which hearts are best suited for your build.
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