Karlach/Romance

Karlach can be romanced.

Companion

Her first scene can be during Chapter One. If the player character has Medium approval they can drum up the courage to tell her how much they like her during the camp celebration after finishing Save the Refugees. This will lead to Karlach meeting the player character, once they have gone to bed and everybody else is asleep. Alternatively, if the player character has High approval, Karlach will do this on her own. Since it is not possible to continue with The Hellion's Heart past the first step in Act One, the player character will not be able to touch her. However, she can be convinced to kiss - which the player character can either end sooner or embrace the moment, only to burn their lips.
After reciprocating her feelings, it's possible to tell her how much they would love to touch her. The player can figure out a way to cool her down with water or frost magic for a quick embrace, going into a discussion of letting the player have fun with others while she's unavailable due to her engine.
Once Act Two is reached and the party has arrived at the Last Light Inn, Karlach's Engine can be repaired with the help of Dammon. During the next long rest (and if no other events are queued), the player character can sleep with her.
- If the sex scene is not triggered by the time the party leaves Act Two (because of other queued long rest events), Karlach will terminate the relationship upon arriving in Act Three. The long rest triggered by entering the road to Baldur's Gate will not trigger the sex scene - it is too late.
During Chapter Three, Karlach will ask to have a "first date" at her favorite restaurant in Baldur's Gate, where she pretends to only just be meeting the player character. Afterwards is a sex scene if nudity is enabled (or simply a kissing scene if nudity is disabled).
Another romance may be started with Halsin in Act Three with an option to check with Karlach first. When approached, Karlach will say that she is not ready, but she agrees to let the player character have both romances if encouraged.
When offered a foursome with the drow twins at Sharess' Caress, Karlach will always decline, but she is supportive if the player chooses to sleep with one of them, encouraging them to have fun but save some intercourse for her later.
It is possible to have an intercourse with Mizora. The player character will be caught by Karlach at the end of it and asked to explain. She will be deeply hurt, but she will not end the relationship.

Romance Mechanics

This section contains information regarding the unique in-game mechanics and interactions for Karlachs's romance.

Relationship Stages

Like the other major romance options in the game, Karlachs's relationship progression can be divided into specific stages: friendly, flirting, partnered, and ex-partnered:

Friendly: The friendly stage begins at medium approval, and is the default stage for non-romanced companions.
Flirting: Once the player character repairs the first part of Karlach's Infernal Engine, they will enter the flirting stage.
Partnered: In Act 2 with high enough approval, if the player character is not in the partnered stage with any other companion and her Infernal Engine is repaired, they are able to partner with Karlach. This stage comes with unique party/camp interactions.
Ex-Partnered: Once partnered with Karlach, the player character can break up with her anytime by selecting the appropriate dialogue option.

Unique Dialogue

Greetings

Player characters who romance Karlach will hear unique greetings dependent on the stage of the romance and approval/game progression:

Friendly:

"Hey, soldier."
"Soldier?"
"What's on your mind?"
"Copper for your thoughts?"

Flirting:

"Hey, you."
"What're you thinking about?"
"Oh, hi!"
"Hey, soldier." (low approval)
"Uh huh?" (low approval)
"What is it?" (low approval)

Partnered:

"Darling."
"Hey!"
"Soldier?"
"Hey, you."
"What's on your mind?"
"Yeah, honey?" (low approval)
"Hmm?" (low approval)

Ex-Partnered:

"Hey, soldier." (high approval)
"Yeah?" (high approval)
"What's on your mind?" (high approval)
"What?" (low approval)
"Yeah?" (low approval)
"Something on your mind?" (low approval)

If broken up with (ex-partnered), Karlach's greetings return to her regular, friendly greetings.

Party/camp Interactions

While in the partnered stage (following her relationship progression scene in Act 2), Karlach will have the following unique dialogue options that are always available when interacting with her both in camp and while she's in the party, which can be instigated by selecting "About our relationship...":

The player character can inquire about Karlach's feelings regarding the relationship ("Are you happy with how things are between us?").
The player character can ask for a kiss ("Can I kiss you?").
The player character can break up with Karlach. ("Karlach, I think things have gone far enough between us.")

Origin

Like her Companion counterpart, Origin Karlach's infernal engine presents a challenge to pursuing romance, and her personal story progression affects when and if specific romantic interactions are available with different characters. An incomplete list is below:

Astarion

Karlach is the only player character who can progress Astarion's romance without having sex. In his Act One romance scene, instead of initiating sex, Astarion will become frustrated and confused that he can't touch Karlach. It is possible to suggest they just lay near each other and talk instead, which is a novel concept for him. Karlach still appears naked in the morning.

Astarion’s Act Two romance scene doesn’t account for Karlach’s engine when pressuring him into sex, meaning the implied sex scene (and resulting break-up) will happen even if Karlach isn’t actually able to be touched.

If Astarion ascends, he will inevitably break up with Karlach. If Karlach accepts his proposal to “fix her” and become his spawn, he is unsuccessful in turning her—he will catch on fire after drinking her blood, whether or not her engine is repaired. Enraged, he breaks up with her. This situation leads to a unique post-break-up dialogue where Astarion accuses her of “rejecting him with her whole body” and concludes she is “doomed”.

However, it is still possible for a romanced Ascended Astarion to accompany Karlach to Avernus. Defeating the final boss after ascension but before long resting will preserve their relationship and its romance wrap-up scene, where Astarion will demand she return to Avernus to live and offers to go with her. Accepting his offer proceeds to Karlach’s Avernus ending as normal. Epilogue dialogue implies they are still a couple and, like other Avernus partners, are searching for a way to fix Karlach’s engine.

Wyll

Despite canonically becoming best friends with him in other origins, Karlach is able to romance Wyll in her own origin, and pursuing this option adds a handful of unique lines acknowledging Wyll's prior objective of hunting her down.

Even if Karlach’s engine is not repaired, Wyll insists on dancing with her in his Act Two romance scene. If Karlach protests, Wyll claims he won’t be burnt as long as her emotions are kept under control. (Karlach can even choose to do “a calm twirl” when dancing.) Karlach will be unable to kiss Wyll after their dance; despite his subdued reaction to this, however, he will still become partnered to her afterward.

Wyll heavily encourages Karlach to return to Avernus in their romance wrap-up scene and will go with her, whether it’s to ensure she survives or, if he broke his pact, as part of hunting down Mizora. If Wyll becomes Grand Duke, however, his commitments to Baldur’s Gate render him unable to join her, and their relationship becomes long distance if she goes to Avernus alone.

Lae'zel

Prior to Hotfix #16, Karlach was able to accept Lae'zel's camp party proposition. Lae'zel's sex scene proceeded as normal, as if Karlach were not literally too hot to touch. The camp party dialogue now properly addresses her engine, and Lae’zel complains that she’ll have to find relief elsewhere.

Halsin

If Karlach is partnered to Halsin, he says that he will not go to Avernus with Karlach, but she will not go without him—leaving death as her only option unless she became a mind flayer.

Minthara

Karlach is not given the option to sleep with Minthara after completing Raid the Emerald Grove; however, the latter can be romanced upon recruiting her to the party and upgrading Karlach's engine. In her romance wrap-up scene, Minthara demands to go to Avernus together and make Zariel sorry for ever hurting her, and accepting proceeds to Karlach’s Avernus ending as normal. Otherwise, if the player refuses, Minthara breaks down and says that she doesn't accept Karlach's choice but will stay with her until she is gone; it is implied that Minthara travels to Avernus anyway to avenge her.

Dammon

Dammon is necessary to complete Forging a Heart, allowing Karlach to fully engage in romancing her companions. While he cannot be romanced in any playthrough, his dialogue is more flirtatious when speaking to Origin Karlach. When obtaining the second engine upgrade, Karlach can even (internally) comment on this with 'Pause. Is he flirting with you?'.

Karlach can fantasize about kissing Dammon as an alternative to her threesome fantasy during a long rest alone on the Ravaged Beach, although this is not possible in normal gameplay as this scene becomes unavailable after entering the Emerald Grove.

Finding Dammon in Act Three after having already received both engine upgrades has him lamenting his inability to stabilize her engine. He remarks that there is something he would’ve liked to do “in another life”, but doesn’t finish the thought.

Mizora

Despite her hatred of all things Zariel, Karlach can accept Mizora's for sex—unhappily so, especially if you choose to 'Smile the rictus grin of the damned.' when accepting. As Mizora is a cambion, she is an available sex partner for Karlach even if she has not repaired her engine. (She may say only she can bear the “fire of Avernus” within Karlach.) In their sex scene, Karlach has more demanding dialogue choices available to her. If she backs out at any time, Mizora is disappointed, saying she had hoped Karlach was ready to come home.

Haarlep

Like Mizora, Haarlep is of the Hells, so they can be a sex partner for Karlach even when her engine is not fully upgraded.

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