A weapon got the last hit
Stop attacking earlier and face manual-aimed projectiles away from Big Bob.
Big Bob lamp-finisher reward
Bob's Light Item Guide
Epic ItemQuick answer: Bob's Light is an Epic item that releases a light explosion every 45 seconds. It kills nearby non-boss enemies; bosses take 4% Max HP damage instead. Unlock it by making lamp-charging damage deal the finishing blow to Big Bob on Graveyard.
RarityEpic
Base pulse45 seconds
Per extra copy-3s / +10 radius
Red Ghost kill chance33%
How to Unlock Bob's Light
- Reach Big Bob on Graveyard. Complete the four-key Crypt route and enter the boss arena.
- Fight normally at first. The current requirement does not demand lamp-only damage for the entire fight.
- Stop uncontrolled damage near the end. When Big Bob is low, move away, stop firing toward him, and avoid damage-triggering items.
- Charge a lamp and let its damage finish Big Bob. The lamp damage must deliver the killing blow.
- Claim the unlock. Check the Unlocks menu after the run and purchase it there if the game presents a Silver purchase step.
Current rule: only the finishing blow needs to come from lamp-charging damage. Older guides that require every point of boss damage to come from lamps are outdated.
How Bob's Light Works
| Target | Pulse result | Important limit |
|---|---|---|
| Normal and Elite enemies | Killed when inside the pulse radius | Must be within range when the pulse fires. |
| Bosses | 4% of Max HP as damage | No instant boss kill. |
| Red Ghosts | 33% chance to be instantly killed | If the instant kill fails, the pulse deals 4% Max HP damage. |
The pulse is centered on your character. It does not require a weapon hit and is most valuable once enemy density becomes high enough that ordinary weapons struggle to clear the screen.
Cooldown and Radius Stacking
| Copies | Displayed cooldown rule | Radius change |
|---|---|---|
| 1 | 45-second base cycle | Base radius |
| 2 | 3 seconds shorter | +10 |
| 3 | 6 seconds shorter | +20 |
| Many copies | Cannot fall below 5 seconds | Radius caps at 250 |
Build meaning: one copy is a periodic safety valve; repeated copies transform it into a frequent screen-clear tool. The value rises sharply in long leaderboard-style runs.
Why the Bob's Light Unlock Did Not Register
An item proc stole the kill
Disable or avoid poison, Thorns, explosions, orbiting damage, and other autonomous damage sources for the final phase.
You stood near the lamp but did not charge it
Confirm the lamp is active and that its damage is visibly ticking before waiting for the finishing blow.
Best Uses and Build Fit
Excellent for
- Long survival and leaderboard runs
- High-density Final Swarm control
- Builds that can stack Epic items consistently
Less important for
- Short unlock runs that end before density scales
- Builds that already erase the full screen on a short cooldown
- Runs where another Epic stack is the central win condition
Frequently Asked Questions
How do you unlock Bob's Light?
Kill Big Bob on Graveyard with damage from charging a lamp as the finishing blow.
Do all attacks against Big Bob need to come from lamps?
No. Under the current rule, only the finishing blow must come from lamp-charging damage.
Does Bob's Light instantly kill bosses?
No. Bosses take 4% of their Max HP from a pulse instead.
Does Bob's Light work on Red Ghosts?
Yes. Each pulse has a 33% chance to instantly kill a Red Ghost; otherwise it deals 4% Max HP damage.
Is Bob's Light the same as Bob (Dead)?
No. Bob's Light is a periodic centered explosion, while Bob (Dead) is a separate movement-triggered item.