
The Sacrificial Heart is just one of the many random items you'll have to find a use for in Path of Exile 2. Just like the Sun Clan Relic, you need to bring this grisly trophy to a certain location if you want to claim its bounty—which is well worth it considering you'll get two passive skill points for your trouble.
If you don't use the Sacrificial Heart and complete act three, opening the portal to act one (cruel), this can get a little confusing, since you can only travel to the necessary location by finding a waypoint once you progress a ways through the act. So, here's how to use the Sacrificial Heart, and what to do if you unwittingly travelled to act one (cruel) before using it.