Geptameron is an unlockable active item in Arachna, a mod for The Binding of Isaac.

While heldAdds a counter to the HUD that increases by clearing rooms cycling between 7 values based on the day of the week.

Glowing Hourglass does not reset its number.

On useAll 7 of them grant flight for the current room.

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1. Mighty Monday: Reveals Secret Room and Super Secret Room location and triggers Dad's Key effect.

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2. Terrific Tuesday: For 10 seconds, spawns a friendly Dead Isaac randomly in the room each second.

These Dead Isaacs act more akin to a regular Gaper, chasing enemies directly.

Upon death, they have a 10% chance to drop a Rotten Heart.

They all die upon room clear.

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3. Wise Wednesday: All enemies are charmed or marked with a Locust Mark.

Locust-marked enemies drop 3 random locusts on death.

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4. Torrid Thursday: Summons 2 Guardian Angels and a Holy Mantle shield for the room.

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5. Fleeting Friday: All enemies are marked with a Coin Mark, which cause them to drop 1 to 4 random coins on death.

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6. Sanguineous Saturday: For 10 seconds, spawns a large red crosshair randomly around the room each second.

For each crosshair, after approximately 2 seconds, a large missile will land on the red marker. The missile acts like a large bomb explosion, dealing 80 damage.

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7. Stingy Sunday: 1 to 3 random enemies in the room are marked with a Grab Bag.

When an enemy marked by a Sack Mark Grab Bag dies, it drops a random disappearing pickup and applies the same mark to another random unmarked enemy in the room.
• 35% chance for Key
• 27% chance for Penny
• 26% chance for Bomb
• 7% chance for card/rune
• 6% chance for battery
• Pickups disappear after 2 seconds.

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Beat Boss Rush as Arachna.

This item contributes towards the Bookworm transformation. Collecting 3 items from this set will make Isaac fire an extra tear 25% of the time.

Geptameron can be found in the following item pools:

The following tags are applied to this item:

The following special synergies and interactions for Geptameron have been documented.

* Note that not all possible synergies and interactions are listed here.

• Check out the item description on the mod's external Wiki.
• Download Arachna from the Steam Workshop.