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▾Table of Contents▾
Rusty Mainspring item
Rusty Mainspring is an unlockable passive item in Isaac's Limbus, a mod for The Binding of Isaac.
Description
When entering a room, if there are enemies, Isaac doesn't take damage for 5 seconds.
How to unlock?
Defeat Ultra Greed as 
Rodion.
Item pools
Rusty Mainspring can be found in the following item pools:
| Name | Weight |
|---|---|
| Treasure Room |
1.0/1.0
|
| Devil Room |
1.0/1.0
|
| Shop |
1.0/1.0
|
| Golden Chest |
1.0/1.0
|
| Crane Game |
1.0/1.0
|
| Bomb Bum |
1.0/1.0
|
| Ultra Secret Room |
1.0/1.0
|
| Greed Treasure Room |
1.0/1.0
|
| Greed Shop |
1.0/1.0
|
| Greed Devil Room |
1.0/1.0
|
| Greed Secret Room |
1.0/1.0
|
| Old Chest |
1.0/1.0
|
Tags
The following tags are applied to this item:
| Id | Description |
|---|---|
| tech | Contributes towards unlocking  Technology Zero. |
External links
- Download Isaac's Limbus from the Steam Workshop.
Crown of Thorns 
Impending Wave 
Rainbow Mainspring 
Red Order 
Piece of a Torn Spring 
Green Skin