Caged Heart of the Sacrilegious is a Necromancer Vicious Malignant Heart granting Offensive buffs. Caged Hearts are socketed into their corresponding colored sockets on your jewelry. Once inserted, hearts can be replaced, but NOT removed. These Malignant Hearts were introduced to Diablo 4 in Season 1 - Season of the Malignant.
Caged Heart of the Sacrilegious Mechanics
Caged Hearts can change the way skills and builds work in significant ways. More info coming soon!