To cool down Karlach in Baldur's Gate 3, you have both temporary and permanent methods tied to her companion quest and in-game interactions:
Temporary Cooling Methods
- Throw water at Karlach or use a water-based spell like Create Water to cool her down briefly
- Use cold damage spells such as the ice variation of Chromatic Orb , Ray of Frost , or shoot ice arrows to temporarily reduce her heat
- Move Karlach into a river or other water source in the environment to cool her down momentarily
These actions can advance her dialogue and allow for limited physical interaction like a kiss, but the effect is temporary.
Permanent Cooling Solution
- Progress in Karlach’s companion quest, The Hellion's Heart.
- Find and bring Infernal Iron to Dammon, a Tiefling blacksmith located in the Emerald Grove (Act 1) and later at Last Light Inn (Act 2)
- Dammon will work on a schematic to insulate Karlach’s Infernal Engine, which causes her to run hot.
- After the second installment of Infernal Iron and completing the related quest steps, Karlach’s engine will be stabilized, allowing her to physically interact without burning, unlocking romance options and further dialogue
Summary
- Use water or ice spells and environmental water for quick, temporary cooling.
- Complete Karlach’s quest involving Dammon and Infernal Iron for a permanent fix to cool her down and enable romance progression.
This combination of gameplay actions and quest progression is how you cool down Karlach effectively in Baldur’s Gate 3
