Brain in a Jar

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Desktop/Console/Mobile-Only Content: This information applies only to the Desktop, Console, and Mobile versions of Terraria.
Master mode icon.png
Master Mode-Only Content: This information applies only to Master Mode and Master Mode worlds.
Brain in a Jar
  • Brain in a Jar item sprite
Stack digit 1.png
Use time20 (Very fast)
TooltipSummons a spider brain
'Pickled and shrunken, this brain can no longer hurt you.'
RarityRarity level: Fiery red
Sell5 GC
Research1 required
Grants Buff
BuffSpider BrainSpider Brain(Desktop, Console and Mobile versions)
Buff tooltipIt's crawling around... icky
Summons Pet
  • Spider Brain
    Spider Brain
  • Internal Item ID: 4800 (Desktop, Console and Mobile versions)
  • Internal Buff ID: 287 (Desktop, Console and Mobile versions)
  • Internal Projectile ID: 884
Spider Brain (flying).gif
The Spider Brain flying.
Obtained from Obtained from
Master mode icon.png Master
Brain of CthulhuBrain of Cthulhu (First Phase).gifBrain of Cthulhu125%

The Brain in a Jar is a pet-summoning item that spawns a Spider Brain pet, a miniature version of the Brain of Cthulhu, to follow the player around. The Brain in a Jar has a 1/4 (25%) of being dropped by the Brain of Cthulhu in Master Mode.


  • Desktop 1.4.3: Changed buff tooltip from "It's crawling around . . . icky" to "It's crawling around... icky".