Here is an even better Guide on how to farm the most powerful Wrathful Hearts at the end of Season 1 Questline "The Cold Hard Truth" in Diablo 4.

How to Farm OP Wrathful Hearts in Season 1

The current location that we use is the final part of the quest line for the seasonal Quest - The Cold Hard Truth, so unfortunately, if you have completed this questline with your character, you can't do it again, but you can always make a new character or you have a friend that can invite you that doesn't have this done, so this Quest progress state is called the cold hard truth, this is on the last, this is basically The Last Quest in the seasonal question, the dungeon is located up here in the fractured Peaks and key overshot so whenever your quest is on this cold hard truth this is where you can repeat to run this dungeon basically.

Let's go into this dungeon right here, and the important part is to not talk to the final NPC after you killed the boss, you can just go in here, you can just run through this dungeon, so focus a bit on movement speed usually, and the first little trick here is there's this corrupted growth here that always spawns, this one is wrathful already, so we can just kill this and this one instantly drops, a wrathful heart, this is not the guaranteed one though so you'll get one more there's a chance that you can get multiple ones, so this guy is always worth killing right at the entrance to the boss, so this is going to be two wrathful hearts and one of them will be guaranteed, it's the one that's still dropping from this boss here, so just go in here, and you talk to this guy, you need to destroy these corruption things, and then you need to talk to all E3, because he's going to perform a ritual to spawn one of the bosses, and this boss will always everyone drop a wrathful heart, obviously, it's random, but if you do this a couple times like every 10 minutes, you can get like your Barber Jam if you want to, so he's going to perform richer, now you have to kill like top left then down right then 12 o'clock position so just blast these down real quick, now down here, same thing blast this down real quick boom up here, just get them, and now he'll spawn the boss in the middle, but here is similar and they'll just kill him, and when he dies he will leave a heart that you can pick the guy will even tell you to pick it, you'll be very keen on this, you just take it, we got it, and it'll drop, all you do is just leave dungeon like do not talk to this guy, you can also invite party members, obviously, they can just join your group and then you don't even need to leave dungeon, you can just right click leave party right, but now we leave the dungeon and hopefully, the reset dungeon button is working, it's not like usually you can reset, but it's packed right now and it doesn't always work so you can just leave the game, press leave, and then log in again with our seasonal character, and then you will be spawned right outside of this final dungeon Quest again, you can just go in and repeat the same progress do the entire run again, because it's reset and just keep in mind to not finish the quests and here's again the questline, hold hard truth, don't finish it, here is the dungeon location, and again you can invite three of your friends, even if they complete the quest you can just invite them, and get them into your game, and they also all of them will get a wrathful heart guaranteed, and this is a very nice way to farm in the hearts here that you really want, because these Hearts especially the Barbro one, the Martian's heart here critical strikes and all sorts of kind of damage within x amount of seconds will be absorbed by your Target and then released and multiplied, this is the one that creates this like huge damage explosions.