Vicious Heart can be inserted into Vicious malignant sockets, found in Jewelry.
The following is an example: Caged Heart of the Picana. It grants Critical Strikes electrically charge the enemy for 2.89 seconds, causing lightning to arc between them and any other charged enemies dealing 64 Lightning damage.
Once Inserted, hearts can be replaced, but not removed.
Replace Heart: A heart can be placed into a piece of gear with a heart already socketed into it. This will destroy the original heart.