How do you keep Karlach alive?
It seems that if Wyll becomes the blade of avernus she can take Karlach to avernus and save her from exploding.
Can you actually save Karlach? Yes. There is 100% a way to save karlach. There might not be a way to repair her heart entirely but it is possible for her to live past end credits at least.
Can I revive Karlach after killing her? After speaking with Wyll, his dialogue about Karlach being killed should trigger.
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