Binding of Isaac: Rebirth Wiki
Binding of Isaac: Rebirth Wiki

Added in Repentance

Lemegeton is an activated item added in The Binding of Isaac: Repentance.


  • Upon use, Lemegeton will grant a random passive item from the current room's item pool as an orbital familiar. The item must have the 'summonable' item tag in order to be generated.
    • These familiars can block up to 4 shots and/or get hit by 2 explosions before being destroyed. When the familiar is destroyed, the item it granted is lost.
    • Familiars also deal contact damage to enemies equal to 2x Isaac's damage per tick (4x Isaac's damage per second). They do take contact damage.
    • Isaac can have up to 24 familiars: an inner counterclockwise ring of 6, a middle clockwise ring with 8, and an outer counterclockwise ring of 10.
      • Using Lemegeton while Isaac already has 24 causes the oldest one to be replaced.
  • This item belongs to the Bookworm set. Collecting three items from this set will transform Isaac into Bookworm.


  • Tainted Bethany Tainted Bethany starts with this item in the consumable slot.
    • When playing as Tainted Bethany, picking up 15►4.5 Volt 4.5 Volt will cause Lemegeton to no longer gain charges as long as her normal active item has empty charges.
  • Although 15►Delirious Delirious and 15►Mr. ME! Mr. ME! are marked as summonable, their wisps do nothing and grant no effects.
  • Items given by Lemegeton are separate from the normal item pools and Isaac's current collection of items. This has the following effects:
    • Isaac can still normally find items that were previously summoned by Lemegeton.
    • Isaac can have multiple wisps of the same item.
    • Wisps cannot be rerolled by 15►Missing No. Missing No. or the 15►D4 D4 / 15►D100 D100.
    • Wisps do not count towards transformations.
    • Summoned items do not count towards the Collection Page.
  • Items that would normally add or remove hearts/consumables (such as 15►Boom! Boom!, 15►Breakfast Breakfast, 15►Abaddon Abaddon etc.) do not do so if given by Lemegeton.


  • 15►Book of Virtues Book of Virtues: Lets Lemegeton's wisps shoot homing tears once per second that deal 3 damage.
  • 15►Rock Bottom Rock Bottom: Stat increases remain even after its wisp has been destroyed.
  • 15►Satanic Bible Satanic Bible: Using Lemegeton in a Boss Room Boss Room after activating the Satanic Bible on that floor will pull from the Devil Room item pool, even if the boss wouldn't normally drop an item after defeat.


  • 15►Chaos Chaos: Item wisps will be selected from random pools, regardless of the room Isaac is in.
  • 15►Magic Skin Magic Skin: Can be spawned by Lemegeton if it has been used in the current run.
  • 15►Rosary Rosary: Allows 15►The Bible The Bible to be summoned by Lemegeton, taking up a slot while not providing anything.
  • 15►Sacrificial Altar Sacrificial Altar: Every wisp will be converted to a Half Soul Heart. Familiars created by Lemegeton are sacrificed normally and also spawn full Soul Hearts.

In-game footage[]


  • The Lemegeton is another name for the Lesser Key of Solomon, an anonymous grimoire focused on demonology that was compiled in the 17th century.


Bug Bug! After using 15►Sacrificial Altar Sacrificial Altar or 15►Genesis Genesis, Isaac keeps the passive effects of each wisp until the next use of Lemegeton, which erases all sacrificed passive items.
Bug Bug! If a run is exited and resumed while Isaac has item wisps generated from Lemegeton, all wisps will be condensed into the middle clockwise ring, even if this would result in more wisps on that ring than normally allowed. This also allows further wisps to be generated on the inner and outer rings.