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The Hellion's Heart is a sub-quest of Karlach's Companion quest, 
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Objectives
Objectives and journal entries may vary pending story decisions.
- Karlach needs an infernal mechanic to tune up the engine she has for a heart. There might be one nearby.
- We should bring Karlach to Dammon, the tiefling weaponsmith we met in the druid's grove.
- Dammon inspected Karlach's engine. He said he'll need infernal iron in order to craft a repair.
- We found infernal iron; we should take it to Dammon.
- Dammon upgraded Karlach's engine, but couldn't repair it yet. He'll need time to think of a solution. We should find him in Baldur's Gate - and bring infernal iron with us, too.
- We entered the shadow-cursed lands but didn't yet repair Karlach's heart. We can only hope Dammon made it to the city and can help us later.
- We met Dammon sheltering in Last Light Inn. We should bring Karlach to talk to him.
- Karlach's heart was upgraded again, but Dammon bore bad news: her heart can't keep going outside of the Hells. Karlach will die if she doesn't return to Avernus.
- Dammon can no longer help repair Karlach's heart.
- Karlach left us - she won't be coming back.
- Karlach is gone forever.
- We failed to repair Karlach's heart.
- We never found a mechanic who could help repair Karlach's heart.
Walkthrough
The Hellion's Heart begins after Karlach is recruited and opens up about her Infernal Engine. For example, if Karlach was taken to defeat the Paladins of Tyr as part of Hunt the Devil, she admits that the engine has been running hot since she left Avernus and that she needs to find an infernal mechanic.
Finding an Infernal Mechanic
It's possible to catch up with the infernal mechanic in three places:
- At the Druid Grove, in The Hollow.
- At the Last Light Inn, in the barn.
- In the Lower City, at the Forge of the Nine
The mechanic is a tiefling named Dammon. When the city of Elturel fell to Avernus, Dammon was there and was put to work as a mechanic. Upon meeting Karlach, he recognizes that her heart is from the hells. He believes he can help her, but needs to materials to do so. He has spotted several pieces of Infernal Iron on his travels and believes it is needed to aid Karlach.
There are many places Dammon can die. During the raid on the Grove in Raid the Grove, Dammon can become a casualty. Dammon can die during an attack on the Last Light Inn by Marcus and his minions. If Dammon reaches Baldur's Gate, he's safe so long as the party doesn't randomly murder him.
Infernal Iron Locations
There are several different places to find Infernal Iron. Karlach's heart only needs two to get all upgrades from Dammon. Possible locations include:
- In the basement of the Blacksmith's House in the Blighted Village - in the chest with the Highcliff's Blueprints.
- In the locked room above Dror Ragzlin's throne in the Shattered Sanctum.
- Received from Kith in Grymforge if all three checks are passed about the Ruins.
- Inside the Mason's Guild in Reithwin Town in the Shadow-Cursed Lands.
- In the locked room on the left in the back of the Zenthariums Hideout in act 1 where you can start the "Free the Artist" questline.
Upgrading Karlach's Heart
To repair Karlach's heart, return to Dammon with Karlach in the party. Karlach must install the upgrades herself, so this only works if Karlach is present.
After the first upgrade, Karlach still feels hot, but not as much as before. She feels more powerful than ever, but it's not enough to solve the problem. Dammon commits to keep working and says he'll consider the possibility of enchanted coolant. He advises the party to look for more Infernal Iron on the road for when they meet again.
Once the second upgrade is complete, Karlach can touch other people again without burning them up. She is immensely excited and can be hugged. The moment is highly significant for Karlach, who hasn't touched another person in ten years.
If the first upgrade is done in the Grove, Dammon says he must think more about how he can help Karlach. He won't have a clear idea until after the party meets him again at the Last Light Inn. If the party initially encounters Dammon at the Last Light Inn, both upgrades can be received after a Long Rest. If Dammon was met in Baldur's Gate, both upgrades can be received at the Forge of the Nine after a Long Rest.
Notes
- Although the Steel Watch has unique interactions to Karlach's infernal engine and the Gondians worked with infernal iron, there are no options to pursue more solutions for Karlach past the two upgrades with Dammon.