Effect: +1 chance to proc on-hit effects. Items with a chance to trigger on hit get an extra roll per hit. This can result in multiple triggers of a single item from one hit.
Unlock: Available from the start - no unlock required
The Overpowered Lamp is a Legendary item that gives every on-hit effect item an extra proc roll per hit. Instead of rolling your Ice Cube's 20% freeze chance once per hit, it rolls it twice. A 7.5% poison chance rolls twice. A 27% Bloodmark chance rolls twice. Every chance-based on-hit item in your build becomes significantly more consistent.
Critically, the extra roll happens regardless of whether the first roll succeeds or fails. It is not a re-roll on failure - it is a fully independent second roll. A 10% effect with one Lamp has approximately 19% effective chance (1 minus the chance that both rolls miss). Multiple Lamps stack further, each adding another independent roll.
It also stacks within a single run. A second Lamp gives each qualifying item three rolls per hit. A third gives four, and so on. The value scales directly with how many proc-based items your build contains.
The Overpowered Lamp is worth very little in a build with no on-hit proc items. It is worth an enormous amount in a build stacking five or six of them. Prioritize building proc items alongside the Lamp rather than treating it as universally powerful on its own - its ceiling is as high as the number of qualifying items you have.
The wiki lists exactly which items receive extra rolls from the Overpowered Lamp. This is the complete confirmed list:
| Item | Base Proc Chance |
|---|---|
 Moldy Cheese | 40% poison on hit |
 Ice Crystal | 7.5% freeze on hit |
 Unstable Transfusion | 27% Bloodmark on hit |
 Kevin | 25% self-punch on hit |
 Slutty Cannon | On hit AoE |
 Quin's Mask | 50% Thorns explosion |
 Eagle Claw | 8% launch chance |
 Grandma's Secret Tonic | 50% crit explosion |
 Cursed Grabbies | 5% curse on hit |
 Big Bonk | 2% mega-bonk on hit |
 Spicy Meatball | 25% explosion on hit |
 Ice Cube | 20% freeze on hit |
 Power Gloves | 8% blast on hit |
 Lightning Orb | 25% lightning on hit |
 Dragonfire | 15% fire on hit |
 Joe's Dagger | 1% Execute on hit |
 Bloody Cleaver | 50% Bloodmark on hit |
The wiki explicitly notes that despite having the same trigger condition as Grandma's Secret Tonic, Demonic Blade and Giant Fork do NOT receive extra proc chances from the Overpowered Lamp. If you are building a crit-focused run and expecting the Lamp to boost Giant Fork's Megacrit proc rate, it will not. This is a confirmed exception documented on the wiki.
The Overpowered Lamp is available from the start with no unlock requirement. It is in the default item pool and can appear from Treasure Chests and the Shady Guy NPC from your very first run. As a Legendary item it drops less frequently than Common or Rare items, but no unlock or Silver purchase is needed.
Amog - Amog's poison build relies on Moldy Cheese as the primary proc source. Overpowered Lamp doubles the 40% poison chance on every hit, significantly increasing poison application rate and therefore the frequency of Amog's chain explosion passive triggering.
Bandit - Bandit's high attack speed generates more hits per second than most characters. Each extra hit is another opportunity for every Lamp-boosted proc to fire. In a Bandit build stacking Joe's Dagger, Ice Cube, and Moldy Cheese, the Lamp's extra rolls fire constantly across a large number of hits per second.
CL4NK - CL4NK's crit passive pairs with Grandma's Secret Tonic (which does work with the Lamp) and Joe's Dagger. The Lamp's extra roll on both items combined with CL4NK's high hit rate makes critical-based proc chains very consistent late in the run.
It gives every on-hit effect item an extra independent proc roll per hit. A 20% freeze chance rolls twice instead of once. The extra roll fires regardless of whether the first roll succeeded or failed - it is not a re-roll on failure, it is a separate additional roll. Multiple Lamps stack, each adding another independent roll per hit.
No. The wiki explicitly confirms that Giant Fork does not receive extra proc chances from the Overpowered Lamp, despite appearing to have the same on-hit condition as Grandma's Secret Tonic, which does work with the Lamp. Demonic Blade is the same - it looks like it should work but does not. This is a confirmed exception on the wiki.
No unlock is required. The Overpowered Lamp is available in the default item pool from the start of the game. It can appear from Treasure Chests and the Shady Guy NPC on any run without any prerequisite.
Yes. Each additional Overpowered Lamp in a run adds another independent proc roll per hit to all qualifying on-hit items. Two Lamps give each item three rolls per hit. The value scales directly with how many proc-based items are in your build.
