Leveling up isn't the only way to get stronger Path of Exile 2. Getting better items is arguably more important than getting a few extra levels, but if you really need to get a new passive or two, there are tons of things in the game that can give you extra points. The sacrificial heart is one such object.
The Sacrifice Heart is one of many permanents PoE 2 promotional bonuses that players can earn. It's a quick way to get some extra power, but as with many things in this game, figuring out what to do with it can be a bit confusing.
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What to do with the sacrificial heart in PoE 2
The Sacrificial Heart is a useful quest that players can use in a ritual to get some free passive points. To do that, you must travel to Aggorat in Act 3. This is the penultimate zone that only becomes available when players activate the portal in the Ziggurat camp.
Once you reach Aggorat, you must fight your way through hordes of Vaal fighters and search for a large stone altar guarded by an elite monster and its minions. As usual, there will be a checkpoint near this area to help you find it. After getting rid of the enemies, pick up the nearby sacrificial dagger and place the heart on the altar. Interact with it, and your character will cut open the heart, giving you extra skill points in the process.
Where to find the sacrificial heart
If you're wondering where you can get the Sacrificial Heart, it's a random drop from enemies in 400 BiC Utzaal and Aggorat, much like the relics for the Ancient Vows quest in PoE 2. It may take a while before you can get it, but once you do, go straight to the location mentioned above to use it. Note that empty instances are reset every 8-15 minutes. Once you've found the stone altar, try not to leave that map instance for too long or you'll be forced to find it again.
Entering Aggorat on Cruel difficulty
Once you beat the boss of Act 3, the return portal from 400 BiC to the Ziggurat Encampment will automatically send you back to the beginning of Act 1 (but on terrible difficulty). To use the Sacrifice Heart without fighting your way to Act 3 Cruel, go to a waypoint and teleport back to Aggorat in Act 3 Normal.