Feed the Mind Flayer - eXputer Wiki

Key takeaways

The quest is short in scope but has mutually exclusive outcomes and a possible post-feeding reversal.

Start at the abandoned windmill Investigate the abandoned windmill in Rivington and enter its basement to find the starving newborn mind flayer.
Bring a humanoid corpse for the peaceful route The cooperative outcome requires providing the creature with a humanoid corpse, after which it grants a psionic boon.
Killing changes the loot outcome If you kill the mind flayer, the available rewards include a Mind Flayer Brain and the Ring of Truthfulness.
The ring improves Insight checks The Ring of Truthfulness provides an advantage on Insight checks and is identified in the source material as a primary quest reward.
Feeding does not necessarily end the encounter The mind flayer may still be killed after it has been fed, which can provide additional experience points.

Overview

Feed the Mind Flayer is an optional Act Three side quest in Rivington that begins at an abandoned windmill and ends with a direct choice about the fate of a starving newborn mind flayer.

The quest starts when you investigate an abandoned windmill in Rivington and enter the structure's basement. This underground area contains a newborn mind flayer that is starving, creating a compact encounter built around conversation, preparation, and the player's willingness to deal with the creature's need rather than treating the meeting as an automatic combat encounter.

When you meet the mind flayer, you have two clearly different approaches. You can attack it immediately, or you can provide a humanoid corpse to satisfy its hunger. Feeding the creature produces a psionic boon, while killing it permits you to loot a Mind Flayer Brain and the Ring of Truthfulness.

The decision is not necessarily final at the moment you feed the creature. The available source material states that the mind flayer can still be killed after feeding, allowing the player to pursue additional experience points as well. This makes the quest unusually flexible, although choosing violence after cooperation changes the outcome of the encounter and should be treated as a major spoiler.

Where this sits

Act ThreeCurrent act

RivingtonQuest area

Abandoned windmillStarting location

Windmill basementEncounter location

1Reach RivingtonareaThe quest is located in this Act Three area.
2Investigate the abandoned windmilldiscoveryThe investigation leads to the quest's entrance.
3Enter the basementlocationThe newborn mind flayer is found below the windmill.
●Choose the creature's fatechoiceAttack it or provide a humanoid corpse.

Feed the Mind Flayer is a self-contained optional quest reached through exploration in Rivington.

Requirements

Reach Rivington in Act Three and investigate the abandoned windmill. A humanoid corpse is needed if you intend to feed the mind flayer.

RequiredReach RivingtonThe quest is located in Rivington during Act Three.
RequiredInvestigate the abandoned windmillThe quest begins by exploring the abandoned windmill rather than by receiving a separately named objective in the supplied facts.
RequiredEnter the basementThe starving newborn mind flayer is encountered in the windmill's basement.
RecommendedHumanoid corpseBring a humanoid corpse if you want to satisfy the mind flayer's hunger instead of attacking it immediately.

Objectives

Investigate the abandoned windmill in RivingtonThe investigation provides access to the basement where the quest's central encounter occurs.
Enter the windmill basementExplore below the windmill to locate the starving newborn mind flayer.
Decide whether to attack or feed the mind flayerThe encounter supports either immediate violence or supplying a humanoid corpse.
Claim the outcome of your decisionFeeding grants a psionic boon; killing allows the Mind Flayer Brain and Ring of Truthfulness to be looted.

WalkthroughSpoilers

01
Investigate the abandoned windmill
Go to the abandoned windmill in Rivington
Travel to Rivington during Act Three and investigate the abandoned windmill. The supplied information identifies this windmill as the quest's starting point, so search it rather than looking for a separate quest giver.
Location: Rivington
TipApproach the windmill as an exploration site and be prepared to continue below it.
02
Find the newborn mind flayer
Enter the windmill basement
Once the windmill has been investigated, enter its basement. The basement is the important location for the quest because it contains the starving, newborn mind flayer and the decision that determines the reward.
Location: Abandoned windmill basement
Watch outDo not assume that entering the basement automatically requires combat; the encounter supports a feeding option as well as an attack.
03
Choose how to respond to the mind flayer
Assess the starving newborn mind flayer
Speak with or otherwise confront the newborn mind flayer in the basement. At this point, decide whether your party will attack the creature or provide it with a humanoid corpse to satisfy its hunger.
Location: Abandoned windmill basement
Watch outThis is the quest's central outcome choice, so decide which reward path you want before committing to violence.
04
Feed the mind flayer
Provide a humanoid corpse if you choose to feed it
Use a humanoid corpse to satisfy the mind flayer's hunger rather than attacking it immediately. Feeding the creature leads to a psionic boon, making this the cooperation-focused outcome.
Location: Abandoned windmill basement
TipHave the corpse available before choosing the feeding route so the choice can be completed when it is offered.
Missable
05
Complete the feeding outcome
Receive the psionic boon
After the mind flayer has been fed, collect the result of the cooperative resolution: the creature grants you a psionic boon. The supplied facts do not specify the boon by name or provide its numerical effects.
Location: Abandoned windmill basement
Watch outThe exact properties of the psionic boon are not specified in the source pack.
Missable
06
Defeat the mind flayer
Kill the mind flayer if you choose the violent outcome
Attacking the newborn mind flayer resolves the encounter through combat and makes its body available for looting. This route is associated with the Mind Flayer Brain and the Ring of Truthfulness.
Location: Abandoned windmill basement
Watch outKilling the creature forfeits the straightforward feeding resolution and its psionic boon.
Missable
07
Collect the violent-route rewards
Loot the available rewards
After killing the mind flayer, search it for the Mind Flayer Brain and the Ring of Truthfulness. The ring provides an advantage on Insight checks and is the primary reward identified for the quest.
Location: Abandoned windmill basement
TipCheck the defeated creature before leaving the basement so the listed rewards are not overlooked.
Missable
08
Resolve the encounter after feeding
Consider the post-feeding choice
The source material states that you can still kill the mind flayer after feeding it. This allows you to pursue additional experience points, but the supplied facts do not establish the complete combined reward inventory or every consequence of doing so.
Location: Abandoned windmill basement
Watch outThis action changes the cooperative outcome into a later violent resolution.
Missable

Mission mechanicsSpoilers

Feed the Mind Flayer is structured around an encounter-state choice rather than a long chain of objectives. The important mechanical distinction is whether the player attacks the starving creature or supplies a humanoid corpse. The first route is direct and violent; the second route satisfies the mind flayer and produces a psionic boon.

The quest also allows a degree of outcome flexibility because feeding the mind flayer does not permanently prevent a later attack. Players who want the cooperation outcome can feed it first, while players pursuing additional experience points can subsequently kill it. Because the source pack does not document the full combined result, the safest guide advice is to treat this as a separate, spoiler-heavy option rather than assuming every reward stacks.

The Ring of Truthfulness has a clearly documented effect: it provides an advantage on Insight checks. The source pack does not give the Mind Flayer Brain's effect or the exact nature of the psionic boon, so those details should be checked in-game rather than inferred from the quest's name.

What works and what does not

Strengths

The quest presents a meaningful choice between violence and cooperation instead of forcing a single resolution.
Both major approaches provide a distinct reward outcome: a psionic boon for feeding, or loot including the Ring of Truthfulness after a kill.
The Ring of Truthfulness offers a useful benefit for characters making Insight checks.
The encounter can be revisited conceptually after feeding because the mind flayer may still be killed for additional experience points.

Weaknesses

The quest's rewards are tied to a morally dark encounter involving a starving newborn mind flayer and a humanoid corpse.
The exact effect of the psionic boon is not identified in the supplied material.
The Mind Flayer Brain's gameplay effect is also not documented in the supplied material.
The source pack does not describe the full consequences of killing the creature after feeding it.

Best uses

Choose feeding when you want the psionic-boon outcome.
Choose the kill route when the Mind Flayer Brain and Ring of Truthfulness are more valuable to your build or when you want the violent resolution.
If you are experimenting with outcomes, save before the basement encounter.

Choices and consequencesSpoilers

Attack the newborn mind flayer immediately
The creature can be killed and looted for a Mind Flayer Brain and the Ring of Truthfulness. The source material associates this route with the ring's advantage on Insight checks.
Spoiler
Provide a humanoid corpse
The mind flayer's hunger is satisfied and it grants the player a psionic boon.
Spoiler
Kill the mind flayer after feeding it
The source material says this remains possible and can provide additional experience points, but it does not document the complete combined reward outcome.
Spoiler

Quest checklist

Reach Rivington during Act ThreeThis is the area and act identified for the quest.
Investigate the abandoned windmillThe windmill is the quest's starting location.
Enter the windmill basementThe newborn mind flayer is found below the windmill.
Decide whether to attack or feed the mind flayerThis choice determines the main outcome.
Carry a humanoid corpse if pursuing the feeding routeThe corpse is used to satisfy the creature's hunger.Optional
Receive the psionic boon after feedingThis is the documented cooperative reward.Optional
Loot the Mind Flayer Brain after killing the creatureThis is one of the documented violent-route rewards.Optional
Loot the Ring of Truthfulness after killing the creatureThe ring grants an advantage on Insight checks.Optional
Decide whether to pursue the post-feeding killThe creature can still be killed after being fed, according to the supplied source.Optional

Collectibles and notable rewardsSpoilers

01
Ring of Truthfulness
Where: The abandoned windmill basement, after killing the newborn mind flayer.
Provides an advantage on Insight checks and is identified as a primary reward for completing the quest.
Missable
02
Mind Flayer Brain
Where: The abandoned windmill basement, after killing the newborn mind flayer.
The source confirms that it can be looted from the killed creature but does not specify its gameplay effect.
Missable
03
Psionic boon
Where: The abandoned windmill basement, after feeding the newborn mind flayer a humanoid corpse.
Granted by the mind flayer as the cooperative outcome; the exact effect is not specified in the source pack.
Missable

Failure conditionsSpoilers

Attack the mind flayer before feeding itThis commits the encounter to the violent route unless the game state provides another documented opportunity; the supplied facts do not describe any reversal.
Leave without providing a humanoid corpseIf you intend to feed the mind flayer, the source material identifies a humanoid corpse as the required offering.
Kill the mind flayer after feeding itThis ends the creature's survival and changes the cooperation-focused outcome, although it can provide additional experience points.

On failure

The source pack does not document named checkpoints, reload behavior, or a formal quest-failure screen.

Rewards and dropsSpoilers

Psionic boon
Granted when the starving newborn mind flayer is fed a humanoid corpse. Its exact effect is not specified in the source pack.
Mind Flayer Brain
Available to loot if the mind flayer is killed. The source pack does not specify its effect.
Ring of Truthfulness
Available after killing the mind flayer; it provides an advantage on Insight checks.
Additional experience points
The source states that killing the mind flayer after feeding it can grant additional experience points, without specifying an amount.

AftermathSpoilers

The outcome depends on what you do after entering the basement

Feeding the newborn mind flayer grants a psionic boon, but the encounter can still turn violent afterward. Killing it provides the documented loot route, including the Ring of Truthfulness, and killing it after feeding can provide additional experience points.

Trivia

The quest is notable for allowing either violence or cooperation in the same encounter.
Its starting location is an abandoned windmill rather than a conventional quest hub.
The central creature is described as a newborn mind flayer that is starving.
The Ring of Truthfulness is associated with an advantage on Insight checks.
The quest allows the player to feed the creature and then still choose to kill it later.

Sources

bg3.wiki — bg3.wiki

Relationships

Location

RivingtonTakes place inThe Act Three area containing the abandoned windmill where the quest begins.

Context

Baldur's Gate 3GameThe game in which Feed the Mind Flayer appears.