
Each of Diablo 4's live service seasons will shake up its gameplay with a temporary new addition or system, as Blizzard wants to ensure that the popular ARPG feels consistently fresh to play throughout the months and years to come. At the core of its first season, Season of the Malignant, are Malignant Hearts — unique items that give players valuable bonuses when equipped. With these, players are able to augment and fine tune their builds even more than they could during Diablo 4's "preseason" launch period.
Here's a full breakdown of everything you need to know about Malignant Hearts while battling your way through Sanctuary in Diablo 4 Season 1. This includes a detailed explanation on what they are and how they work, all the different ways you can get them, and a complete overview of each Malignant Heart type and bonus effect.