To save Minsc in Baldur's Gate 3, the key steps are:
- Ensure you have recruited Jaheira in Act 2 and keep her alive.
- Have Jaheira in your party before confronting Minsc in the Sewers during Act 3.
- In the fight against Minsc, reduce his health to very low (below 5 or 10 HP).
- Use a non-lethal blow to incapacitate him as the final attack. This can be done by toggling the non-lethal damage passive available in the spellbook under common skills for certain characters.
- Do not kill Minsc by lethal attacks or spells; if he dies, you lose the chance to save him.
- After incapacitating him, insist to the Emperor (through Jaheira's influence or an Intimidation/History check) to extend protection from tadpoles to Minsc.
- This will calm Minsc and allow you to recruit him, also leading to finding and reuniting him with his companion Boo.
Key notes:
- Bringing Jaheira along is critical; without her, it is much harder or impossible to save Minsc.
- Fists or melee attacks without the non-lethal toggle will kill him, so carefully use characters with the non-lethal attack skill.
- After the fight, follow Minsc deeper to reunite him with Boo, then you can recruit him to your camp.
This process happens in Act 3, starting from the Lower City area, involving the Counting House and the Sewers, specifically the Abandoned Cistern area.