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 | Spoiler warning: The following content contains unhidden spoilers. Read at your own risk. |
A full-illithid is a character who has undergone complete ceremorphosis and become a mind flayer. This option will only become available after travelling to the Astral Plane during the quest Confront the Elder Brain.
| Full-illithid | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Medium Aberration | |||||||||||||
| Mind flayer | |||||||||||||
 | |||||||||||||
| Stats | |||||||||||||
| Armour Class | 16 | ||||||||||||
| Weight | 60 kg ( lb) | ||||||||||||
| Initiative | +1 | ||||||||||||
| Ability scores | |||||||||||||
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| Proficiency bonus | +2 | ||||||||||||
| Saving throws |
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| Conditions | |||||||||||||
 | Entity has become a mind flayer. | ||||||||||||
 | Can use actions and bonus actions interchangeably. | ||||||||||||
| Features | |||||||||||||
 | Once per turn, reduce an attack target's relevant Ability score by 1. | ||||||||||||
 | Charm an enemy as a reaction. | ||||||||||||
 | If an enemy has fewer HP than you do illithid powers, it dies, damaging nearby creatures. | ||||||||||||
 | Add your Proficiency bonus to the first attack roll or ability check. | ||||||||||||
 | Once per Long Rest, change a successful Attack Roll into a Critical Hit. | ||||||||||||
 | You can use actions and bonus actions interchangeably. | ||||||||||||
 | React to a spell attack by dealing psychic damage for every level of that spell. | ||||||||||||
 | React by nullifying a spell with a level lower or equal to your proficiency bonus. | ||||||||||||
In order to transform, the player must offer to do so while in dialogue with The Emperor or Orpheus once they have reached the Astral Plane after travelling to the Morphic Pool. If Karlach was brought along, she will also offer to transform. It is not necessary for the player character or Karlach to have accepted the Astral-Touched Tadpole and become a partial-illithid in order to become a full-illithid.
Only the player character, Orpheus or Karlach may undergo the full transformation[Needs Verification].
Changes
Player-characters and Karlach will still have access to their previous set of abilities and proficiencies. However, ability scores, race and type will change (see info box).
Orpheus will have slightly different stats, and only have access to his illithid powers.
Conditions
New abilities
After becoming a full-illthid, the illithid power tree will become locked, [note 1] however most[note 2] abilities, or upgraded versions of abilities, will be gained, as well as some new ones:
And the full-illithid upgrade of Mind Sanctuary:
Old abilities
If the character did not already have the following powers, they will be unlocked:
And the following passives, if they did not already have them:
