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▾Table of Contents▾
Geptameron item
Geptameron is an unlockable active item in Arachna, a mod for The Binding of Isaac.
Description
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.
1. Mighty Monday: Reveals Secret Room and Super Secret Room location and triggers Dad's Key effect.
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.
3. Wise Wednesday: All enemies are charmed or marked with a Locust Mark.
Locust-marked enemies drop 3 random locusts on death.
4. Torrid Thursday: Summons 2 Guardian Angels and a Holy Mantle shield for the room.
5. Fleeting Friday: All enemies are marked with a Coin Mark, which cause them to drop 1 to 4 random
coins on death.
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.
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.
How to unlock?
Beat Boss Rush as 
Arachna.
Transformations
Item pools
Geptameron can be found in the following item pools:
| Name | Weight |
|---|---|
| Treasure Room |
1.0/1.0
|
| Angel Room |
1.0/1.0
|
| Library |
1.0/1.0
|
| Greed Angel Room |
1.0/1.0
|
Tags
The following tags are applied to this item:
| Id | Description |
|---|---|
| book | Contributes towards the Bookworm transformation. |
| offensive | Can appear for  Tainted Lost. |
Special synergies
The following special synergies and interactions for Geptameron have been documented.
| Mod | Item | Synergy |
|---|---|---|
| --- | Book of Virtues | Spawns a wisp that has a chanche to struck enemies with  Crack the Sky beams upon damaging them |
| --- | Hive Mind | While Wise Wednesday effect is active: Locusts are larger and deal four times Isaac's damage. |
| --- | BFFS! | While Torrid Thursday effect is active: The temporary  Guardian Angels are larger and deal more damage. |
| --- | Tainted Keeper | While Fleeting Friday effect is active: Drops coins from both Tainted Keeper's effect and the coin mark, resulting in even more coins for every enemy killed. |
| --- | Pyromaniac | While Sanguineous Saturday effect is active: Missile explosions heal Isaac. As the missiles are marked with a red crosshair, it gives ample time for him to know where to stand to receive health. |
| --- | Sack Head | While Stingy Sunday effect is active: Grab Bag-marked enemies may drop Grab Bags. These pickups do not disappear after 2 seconds. |
* Note that not all possible synergies and interactions are listed here.
External links
- Check out the item description on the mod's external Wiki.
- Download Arachna from the Steam Workshop.
Arachnid's Grip 
Dad's Newspaper 
The Testament 
3D Glasses 
Egg Toss 
Spider Cake