These world events can spawn chests that sometimes drop Baneful Hearts
Best if you're farming in Diablo 4 Items an area with high event density

Helltide Commander Events (Guaranteed Drop)

These are elite event encounters during Helltides
Guaranteed Baneful Heart drop
Find these events by looking for skull icons with glowing borders on the map during Helltides

Kill Helltide Harbingers

Very high drop rate for Baneful Hearts
Often appear in threat-building areas when your Helltide meter is full
These are mini-bosses and are extremely efficient to farm if you find them frequently

Pro Tip: Blood Maiden Farming Loop

Killing the Blood Maiden also drops hundreds of Aberrant Cinders, which you can immediately turn into more Tortured Gifts-potentially giving you more Baneful Hearts. This feedback loop is one of the most effective ways to snowball Helltide farming.

Strategy:

1. Kill Blood Maiden (get shards + loot)
2. Use shards to open Tortured Gifts (get more Baneful Hearts)
3. Repeat

Bonus Tip: Always bring a Pet with you to auto-collect Aberrant Cinders. It saves massive time.

Best Helltide Area for Farming Baneful Hearts: Gea Kul (Kehjistan)

According to players on Reddit and other community sources, Gea Kul is hands-down the best Helltide zone to farm Baneful Hearts, thanks to:

Two world events that spawn close together (event loops)
Frequent Hellborne, Harbingers, and Commander Events
Great visibility and cheap Diablo 4 Items enemy density