Baldur’s Gate 3: How to Defeat Mystical Carrion (BG3)

This quest can be finished in five minutes or thirty.

If you’re a bleeding heart, like me, then of course you’re helping the poor undead Thrumbo. It might mean sacrificing a magical item, but I have full faith we’ll be able to loot it off Mystical Carrion’s body when we’re done with him. So, let’s hop right to it; here’s how to defeat Mystical Carrion in Baldur’s Gate 3.

Baldur’s Gate 3: All Mystic Carrion Jar Body Parts Locations (BG3)

Unfortunately, if we want to take down the undead necromancer, we’ll need to destroy Mystical Carrion’s organs. And because he’s a mummy, these organs have been spirited away to jars that are now scattered around Lower City. Here’s how to find each of Mystical Carrion’s Organs.

Table of Contents

While Mystical Carrion will turn hostile if we return to the mansion, we have no need to go back just yet. Likewise, we technically only need one organ to make Mystic Carrion killable, and that’s the heart. But by collecting all four pieces, we’ll severely weaken him.

But if all you care about is speed, you can get the heart even faster than the traditional method by killing Thrumbo and looting his body.

Here’s the full, in-depth guide.

Jar of Mystic Carrion’s Lungs Location in Baldur’s Gate 3

The first organ we’ll grab is the lungs. And to get to it, we’ll need to head to the Mortuary entrance, at the very north of Lower City.

Screenshots by Prima Games
  • Red Star – Mortuary and Lungs
  • Green Star – Thrumbo and Heart

The Mortuary door will be set in a corner and locked, but you’ll only need to pass a skill check of 10 to get in.

Screenshots by Prima Games

Once the door is open, you’ll find yourself in, you guessed it, a mortuary. But the Jar of Mystic Carrion Lungs will be on the table, along with a few other herbs and lootable items. Easy!

Screenshots by Prima Games

Jar of Mystic Carrion’s Liver and Jar of Mystic Carrion’s Brain

So, this is a two-for-one deal! These two jars are actually in the same room. To get to them, you’ll need to head into the Sewers.

There are several entrances into the sewer. There’s a locked door in the Guildhall that leads to it. Cardoza’s ritual room has a secret entrance to the sewer. You can use any manhole on the street to access it. You can get to it through the secret door in the basement of Elfsong Tavern. If you’ve solved the Murder Investigation quest, you’ll be able to access it and Bhaal’s door through the cemetery as well.

There are plenty of options, so pick your favorite poison.

Once you’re in the sewers, you’ll want to head all the way to the Northeast, where you’ll eventually hit the Undercity Ruins, go left from the waypoint. There will be a clickable passage that will take you into a crypt-like room.

Screenshots by Prima Games

Head towards the stone wall on your right and you’ll be attacked by mummies. A lot of mummies. Kill them, then lockpick or burst down the door.

Screenshots by Prima Games

This will reveal a secret room that contains in the Gilded Chest to the left of the Jar of Mystic Carrion Liver. To get into the Gilded Chest, you’ll need to pass a throw of 10 or better.

The Jar of Mystic Carrion Brain will be on the table in the center.

But what you must not miss is the book that’s on the desk on the right side of the room. This book is the “Funerary Jar Form and Function”. If you read it, you’ll realize that the last Jar is in Thrumbo.

Screenshots by Prima Games
  1. Jar of Mystic Carrion’s Brain
  2. Jar of Mystic Carrion’s Liver
  3. Funerary Jar Form and Function book

Related: Baldur’s Gate 3: How to Solve the Sluice Gate Puzzle in the Abandoned Cistern (BG3)

Jar of Mystic Carrion’s Heart Location

Return to the beachside house that Thrumbo was hiding in. He’ll still be there, and you can tell him that he has the heart inside his chest. Once he realizes that the heart has been in his chest all along, he’ll be violently ill and vomit it onto the floor.

Screenshots by Prima Games

And that’s the last of them!

How to Defeat Mystic Carrion in Baldur’s Gate 3

Now here comes the hard part.

Drop all four of the Jars of Mystic Carrion body parts on the ground and destroy them however you like. Once they’re shattered, return to Phylgrave’s Mansion. I would highly recommend hiding and then getting a surprise shot on Mystic Carrion, as the moment you start the fight you’ll be ambushed by around seven mummies on all sides.

Screenshots by Prima Games

By getting the drop on Mystic Carrion, you even up the odds. Mystic Carrion and the mummies enjoy inflicting necrotic and poison damage, so get ready for that. But once you’ve finally defeated the room, you’ll be able to loot Mystic Carrion’s body, as promised.

He’ll have the Crypt Lord Ring, which will allow you to use the ability Create Undead. This is very useful, as the mummies you’ll create have 130+ HP and have the capacity to use multi-attacks, making them a great ally to send into mobs.

Screenshots by Prima Games

He’ll also have the Staff of Cherished Necromancy, which naturally helps with Necromancy-based skills, and the Sword of Life Stealing. Both are great weapons.

Thrumboand the other undead minions will then return to the house, and Thrumbo will become a permanent vendor. It’s really the best of all worlds.

Since you’re going to spend so much time in the sewers for this quest, you’re almost guaranteed to stumble across a strange skeleton surrounded by grease monsters. But did you know it’s hiding a secret?

About the Author

Daphne Fama

A Staff Writer at Prima Games since 2022, Daphne Fama spends an inordinate amount playing games of all stripes but has a soft spot for horror, FPS, and RPGs. When she’s not gaming, she’s an author and member of the Horror Writers Association with a debut novel coming out in 2025. In a previous life, she was an attorney but found she preferred fiction to contracts and forms