Baldur's Gate 3

Baldur's Gate 3

55 Achievements

150-200h

PS5
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Ceremorphosis

Ceremorphosis

Make the ultimate sacrifice: become a mindflayer to defeat the Netherbrain.

7.6%

How to unlock the Ceremorphosis achievement in Baldur's Gate 3 - Definitive Guide

This achievement is obtainable in the final part of Act 3. Spoilers ahead (obviously).

The first step happens when you get to the Astral realm. You can choose the option to betray the Emperor and free Orpheus, or stay with The Emperor and not free Orpheus. Either way, the dialogue will get to a point where someone can take the parasite to become an illithid to take down the Netherbrain. There will be an option for you to sacrifice yourself and become the illithid — you must choose this. (*Note - if you have Karlach in your party, she will try to take the parasite herself multiple times. Make sure you always select the option where you refuse this).

You will then transform into an illithid, and you must complete the entire final battle sequences as your new illithid self for the achievement (both courtyard sections and the final boss fight after climbing the brain stem).

Once you defeat the Netherbrain you are brought down to Baldur's Gate for the final cutscenes and dialogue options. If you are planning to enjoy the story and the epilogue, choose whatever dialogue options you want. If you are looking to get this achievement quickly, do the following:

Your achievement will pop during the rolling credits – don't panic if you are still seeing cutscenes and have not gotten the achievement yet.

Edit: Thank you to GoGoActionTeam for confirming that it is not mandatory for you to betray The Emperor to get the option to become an illithid.
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20 Jan 2024 02:45

3 Comments
I haven't completed the game as an illithid yet but I'm curious to see if what you say is true about HAVING to betray the emperor. If you ask him if your able to use the stones, he will end up turning your into an illithid himself.

EDIT: Confirmed that betrayal is not necessary.
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By GoGoActionTeam on 10 Feb 2024 19:00
@GoGoActionTeam Thanks for confirming, I have updated the solution to reflect this new information.
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By lmaooliviaa on 02 Mar 2024 15:39
Karlach became Illithid for me and it still popped. I am not sure if that worked as intended as there where some dialogue in the sequence where you meet your gathered allies before the final stretch, where they spoke about my changed appearance as if my character changed.
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By s3bb86 on 15 Mar 2024 21:25
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After failing in your first attempt to control the netherbrain with the stones, the Emperor will save you by pulling you back into the astral Prison. He will suggest that he come with you and use the stones, but he’s pretty weak, so suggest you become a mindflayer yourself. He’ll tell you to talk to your companions about it first. Most will be against the idea. Karlach will suggest herself to become a mindflayer instead of you. Ignore them. Become a mindflayer and complete the game, killing the netherbrain.



However, as a mindflayer, you lose some abilities. Your strength and dexterity drop to 13, and your Intelligence and Charisma become high. As a mind flayer, you can use bonus actions as actions and vice versa. A build like thief 3/wizard 9 will make great use of these changes, while a pure barbarian will be nearly useless. Thus, if you plan on this achievement, before you get in the boat, talk to Withers and change your class. The Thief rogue’s two bonus actions are fantastic for mindflayer PCs. Other good builds include:
Frontliner: Fighter (Eldritch knight)3/ Thief 3/ Warlock (blade) 6
Healer: Thief 3/Bard (lore) 9
Caster: Fighter 1/Wizard 11
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30 Oct 2023 00:00

Necessarily:
-Turning into Ilithid
-In the end we destroy the brain
-Let's commit suicide

The ending is available for any character (even Dark Seduction, regardless of the decision with Baal)
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12 Sep 2023 00:57

2 Comments
I got it under the following conditions:
- turned into an elite
- killed the brain
- went to hell with Karlakh to kill the demons
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By Koalkcua on 25 Oct 2023 10:46
My hero did not turn into an illithid, in the end Karlakh became an illithid and they gave me the achievement anyway.
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By DIMATI414 on 08 Jan 2024 04:27