Quartz 5

2 min read

publish: true
aliases:

  • Elder Brain
    created: 2026-03-09T12:15:34.404-04:00
    modified: 2026-03-09T12:15:34.404-04:00
    published: 2026-03-09T12:15:34.404-04:00
    tags:
  • ttrpg-cli/compendium/src/5e/vgm
  • ttrpg-cli/monster/legendary-group
    cssclasses:
  • json5e-note
    obsidianUIMode: preview

Elder Brain

Lair Actions

Source: Volo’s Guide to Monsters

When fighting inside its lair, an elder brain can use lair actions. On initiative count 20 (losing initiative ties), an elder brain can take one lair action to cause one of the following effects; the elder brain can’t use the same lair action two rounds in a row:

  • The elder brain casts wall of force.
  • The elder brain targets one friendly creature it can sense within 120 feet of it. The target has a flash of inspiration and gains advantage on one attack roll, ability check, or saving throw it makes before the end of its next turn. If the target doesn’t or can’t use this benefit in that time, the inspiration is lost.
  • The elder brain targets one creature it can sense within 120 feet of it and anchors it by sheer force of will. The target must succeed on a DC 18 Charisma saving throw or be unable to leave its current space. It can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Regional Effects

Source: Volo’s Guide to Monsters

The territory within 5 miles of an elder brain is altered by the creature’s psionic presence, which creates one or more of the following effects:

  • Creatures within 5 miles of an elder brain feel as if they are being followed, even when they are not.
  • The elder brain can overhear any telepathic conversation happening within 5 miles of it. The creature that initiated the telepathic conversation makes a DC 18 Wisdom (Insight) check when telepathic contact is first established. If the check succeeds, the creature is aware that something is eavesdropping on the conversation. The nature of the eavesdropper isn’t revealed, and the elder brain can’t participate in the telepathic conversation unless it has formed a psychic link with the creature that initiated it.
  • Any creature with which the elder brain has formed a psychic link hears faint, incomprehensible whispers in the deepest recesses of its mind. This psychic detritus consists of the elder brain’s stray thoughts commingled with those of other creatures to which it is linked.

If the elder brain dies, these effects immediately end.

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