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* {{cond|Chains of Karsus}} - After using [[Karsus' Compulsion]] on the Netherbrain | * {{cond|Chains of Karsus}} - After using [[Karsus' Compulsion]] on the Netherbrain | ||
* {{cond|Against All Odds}} - If a natural 20 was rolled on the final check to dominate the Netherbrain at the [[Morphic Pool]] it will have this condition, which will greatly reduce its HP. | * {{cond|Against All Odds}} - If a natural 20 was rolled on the final check to dominate the Netherbrain at the [[Morphic Pool]] it will have this condition, which will greatly reduce its HP. | ||
== Encounter == | == Encounter == | ||
===Atop the brain=== | ===Atop the brain=== | ||
* [[Dimension Door]], [[Arcane Gate]] and [[Misty Step]] are all useful spells to have assigned or distributed as scrolls for moving from the entrance | * [[Dimension Door]], [[Arcane Gate]] and [[Misty Step]] are all useful spells to have assigned or distributed as scrolls for moving from the entrance [[Confront the Elder Brain#Atop the Netherbrain|Atop the Netherbrain]] to the Crown of Karsus. | ||
* Stepping | * Stepping directly on the brain's surface will summon hidden [[tentacles]], so it may be easier to approach from the two platforms on either side. Otherwise, if intending to sprint across, it is helpful to use a character who can avoid [[Opportunity Attack]]s, such as one with the [[Mobile]] feat. | ||
* [[Globe of Invulnerability]] is also useful for protecting the caster of [[Karsus' Compulsion]]. '''However''', the nearby [[Mind Flayer]]s will still be able to {{cond|Stunned|stun}} creatures inside the globe, which ends the spell prematurely. | * [[Globe of Invulnerability]] is also useful for protecting the caster of [[Karsus' Compulsion]]. '''However''', the nearby [[Mind Flayer]]s will still be able to {{cond|Stunned|stun}} creatures inside the globe, which ends the spell prematurely. | ||
** Tossing Mind Flayers over the edge with moves like [[Telekinesis]] will not kill them, as they will just reappear atop the Netherbrain. | ** Tossing Mind Flayers over the edge with moves like [[Telekinesis]] will not kill them, as they will just reappear atop the Netherbrain. | ||
* Only party members can enter the Netherbrain's | * Only party members and [[Orpheus]] or the [[Emperor]] can enter the Netherbrain's psyche (or '''The Unbreakable Will of the Netherbrain'''), so once the portal is open it is no longer necessary to continue fighting other enemies. | ||
=== Inside the crown=== | === Inside the crown=== | ||
* On [[Tactician]], the Netherbrain will have 450 hit points. | * On [[Tactician]], the Netherbrain will have 450 hit points. | ||
* The Netherbrain's hit point total can be reduced by 20% for the final fight | * The Netherbrain's hit point total can be reduced by 20% for the final fight via {{cond|Against All Odds}} if the player rolled a natural 20 for the final skill check to dominate the Netherbrain in the [[Morphic Pool]]. | ||
* | * The first attack each round against the Brain will cause it to use [[Retributive Brainquake]], which will damage and potentially {{cond|Slow}} everything in range. | ||
* The Brain will use [[Orb of Negation]] to summon several orbs which cause damage at the end of the next round. These orbs will destroy the platforms beneath them, so it is important to move characters off of any marked platforms. Further, the brain should be quickly killed | * The Brain will use [[Orb of Negation]] to summon several orbs which cause damage at the end of the next round. These orbs will destroy the platforms beneath them, so it is important to move characters off of any marked platforms. Further, the brain should be quickly killed since every platform will be destroyed in only a couple of turns. | ||
* It is strongly recommended to have one's entire party near the portal before casting Karsus' Compulsion. Once the final fight against the | * It is strongly recommended to have one's entire party near the portal before casting Karsus' Compulsion. Once the final fight against the Netherbain begins, it is possible for the Netherbrain to negate all platforms near the portal, preventing party members caught outside from entering. | ||
==Achievements== | ==Achievements== | ||
Revision as of 07:46, 17 March 2024
| The Unbreakable Will of the Netherbrain | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Huge Aberration | |||||||||||||
| Level 20 Elder Brain | |||||||||||||
 | |||||||||||||
| Stats | |||||||||||||
| Armour Class | 15 | ||||||||||||
| Hit points |
| ||||||||||||
| Movement speed | 0 m (0 ft) | ||||||||||||
| Weight | 10000 kg (20000 lb) | ||||||||||||
| Initiative | -15 | ||||||||||||
| Ability scores | |||||||||||||
| |||||||||||||
| Proficiency bonus | +4 | ||||||||||||
| Saving throws |
| ||||||||||||
| Conditions | |||||||||||||
 | Will break free of its domination within 5 turns | ||||||||||||
 | Begins with a portion of its HP missing, depending on an earlier ability check | ||||||||||||
| Features | |||||||||||||
 | Use a reaction to release a brainquake | ||||||||||||
| Actions | |||||||||||||
 | 10d6 Psychic and  in response to damage. | ||||||||||||
 | Mark platforms for negation, destroying them the next turn. | ||||||||||||
| Overview | Combat |
This page focuses on The Netherbrain's behavior during turn-based combat gameplay.
Spells and abilities
Range: 30 m / 90 ft 
Honour Mode
Recharge: Per turn
Conditions
- - After using Karsus' Compulsion on the Netherbrain
- - If a natural 20 was rolled on the final check to dominate the Netherbrain at the Morphic Pool it will have this condition, which will greatly reduce its HP.
Encounter
Atop the brain
- Dimension Door, Arcane Gate and Misty Step are all useful spells to have assigned or distributed as scrolls for moving from the entrance Atop the Netherbrain to the Crown of Karsus.
- Stepping directly on the brain's surface will summon hidden tentacles, so it may be easier to approach from the two platforms on either side. Otherwise, if intending to sprint across, it is helpful to use a character who can avoid Opportunity Attacks, such as one with the Mobile feat.
- Globe of Invulnerability is also useful for protecting the caster of Karsus' Compulsion. However, the nearby Mind Flayers will still be able to
creatures inside the globe, which ends the spell prematurely.
- Tossing Mind Flayers over the edge with moves like Telekinesis will not kill them, as they will just reappear atop the Netherbrain.
- Only party members and Orpheus or the Emperor can enter the Netherbrain's psyche (or The Unbreakable Will of the Netherbrain), so once the portal is open it is no longer necessary to continue fighting other enemies.
Inside the crown
- On Tactician, the Netherbrain will have 450 hit points.
- The Netherbrain's hit point total can be reduced by 20% for the final fight via if the player rolled a natural 20 for the final skill check to dominate the Netherbrain in the Morphic Pool.
- The first attack each round against the Brain will cause it to use Retributive Brainquake, which will damage and potentially Slow everything in range.
- The Brain will use Orb of Negation to summon several orbs which cause damage at the end of the next round. These orbs will destroy the platforms beneath them, so it is important to move characters off of any marked platforms. Further, the brain should be quickly killed since every platform will be destroyed in only a couple of turns.
- It is strongly recommended to have one's entire party near the portal before casting Karsus' Compulsion. Once the final fight against the Netherbain begins, it is possible for the Netherbrain to negate all platforms near the portal, preventing party members caught outside from entering.
Achievements
Hero of the Forgotten Realms
Save the day: kill the Netherbrain and destroy the Absolute tadpoles.
Absolute Power Corrupts
Reign with terror: take control of the Netherbrain and bend the world to your will.
Sins of the Father
Claim your Throne of Blood: take control of the Netherbrain for Bhaal and break the world.