Lazarus is a base-game character in The Binding of Isaac: Rebirth, and unlocking him does not require any DLC. He is tied to a single, repeatable condition involving the temporary heart types you pick up during a run, so almost any character can earn him with a little luck.
Quick answer: Hold four or more Soul Hearts (or Black Hearts) on a single character at the same time during one run. The moment you have four of those hearts at once, Lazarus unlocks permanently.
Unlock condition: four Soul Hearts at once
The unlock triggers on the count of temporary hearts, not on a boss kill or a specific floor. Soul Hearts are the bluish-grey hearts that act as a buffer over your red health. Black Hearts count toward the same total, so a mix of Soul and Black Hearts still works as long as four or more sit in your health bar simultaneously.
These hearts are temporary armor. They are spent before your red hearts when you take a hit, and they cannot be refilled by red-heart healing. Because they drain first, the key is timing. You need all four present together, before any damage knocks the total back down.
Fastest ways to reach four Soul or Black Hearts
Several reliable sources feed into the total. Soul Hearts drop from cleared rooms and bosses, and they often appear when you blow up tinted rocks marked with an X. Sacrifice Rooms can also hand over a Soul Heart for stepping on spikes, though that path costs health to use.
The cleanest route is to start with a character who already begins with several of these hearts and then top up. Azazel is the standard pick because he starts with three Black Hearts. Grab a single Soul or Black Heart before taking any damage and you immediately hit four, unlocking Lazarus on the spot.
| Source | How it helps |
|---|---|
| Azazel’s starting hearts | Begins with three Black Hearts, so one more pickup finishes the count |
| Boss and room drops | Bosses frequently drop Soul Hearts on clear |
| Tinted rocks (marked with X) | Can drop Soul Hearts when destroyed |
| PJ pill/item (Afterbirth) | Grants several Blue/Soul Hearts on pickup |
Tip: Avoid taking hits while you build toward four. Since Soul and Black Hearts are consumed first, every hit you take chips directly into the total you are trying to reach.
How to confirm Lazarus is unlocked
The game shows an unlock notification the instant you hit four hearts, and Lazarus then appears on the character select screen for future runs. If the prompt does not fire, you almost certainly dipped below four at the critical moment, usually because a hit spent one of the temporary hearts before the count locked in. Build the total back up without taking damage and it will trigger.
What Lazarus brings to a run
Lazarus starts with three red heart containers and one unidentified pill. His stats sit close to Isaac, but with slightly lower Range and Luck. The trade-off is a built-in extra life. When he dies, he revives on the exact spot where he fell rather than being sent back to a previous safe room.
That revival turns him into Lazarus Risen. The risen form has stronger base stats, with higher Speed, Range, and Luck plus a damage multiplier, and it gains the Anemic item, which leaves a damaging blood trail after you take a hit. The catch is health. After reviving he is left with a single heart container, so he is fragile until you heal back up.
| Form | Key traits |
|---|---|
| Lazarus | Three red heart containers, one random pill, extra life, slightly low Range and Luck |
| Lazarus Risen | One heart container, higher Speed/Range/Luck, damage multiplier, Anemic blood trail |
Because the stronger stats only arrive after death, some players deliberately die early to play most of the run as Lazarus Risen. If you go this route, hold off on health-up items until after you have revived, since the risen form benefits far more from them. Blood Donation Machines and Devil Deal rooms are practical ways to spend the health you no longer need before the swap.
Note: Lazarus Risen counts as Lazarus for unlocks and completion marks, so any achievement that asks you to clear content as Lazarus still credits him even after the transformation.
Once Lazarus is on your roster, the only thing standing between you and his risen form is a careful death. Keep his low Range in mind, lean on Range and shot-speed pickups early, and let the extra life carry you into the stronger half of the character.
