
The locked roster in Slay the Spire 2 looks like the kind of progression wall that would normally ask for multiple full clears. The good news is that the best current public-web consensus says it is much simpler than that. On a fresh save, Ironclad starts unlocked, and the rest of the cast opens in a fixed chain by starting and ending a run with the previous character: Ironclad → Silent → Regent → Necrobinder → Defect. Multiple guides also agree that failed runs still count, so the fastest method is usually four very short runs, not four Act 3 wins.
If you searched for the practical answer to slay the spire 2 unlock characters, that is the core of it. The one important caveat is that this is based on strong agreement across current secondary guides rather than an official developer FAQ or patch note. In other words, it is the best available read right now, and it appears consistent across outlets, but early access updates could still change it later.
The wording shifts slightly depending on which guide you read. Some say you unlock the next character by “playing” the previous one, while others are more specific and say it happens after you “end” a run as that character. Those descriptions are functionally aligned, but for safety, assume the run should be properly started and then ended from inside the run menu rather than canceled at character select.
If your only goal is to open all StS2 characters as fast as possible, the efficient route is simple: launch a normal run with each newly available character, let the run fully initialize, then use the in-run menu to abandon or forfeit. Because current guides report that a failed run counts, this should advance the chain without requiring a win.
For the cleanest result, use a regular solo run rather than a special mode. The available coverage describing unlocks is talking about standard progression, so there is no reason to introduce unnecessary variables if speed is your priority.
From a fresh save, choose Ironclad and begin a run normally. Once you are clearly inside the run, usually after the map and opening state are loaded, open the menu and choose the option that abandons or forfeits the run. If current guide information matches your version, Silent should become available after that run ends.

Select Silent, start another run, and end it the same way. This should unlock Regent. You do not need to prove anything here. There is no practical reason to force a long climb unless you want early familiarity with Silent’s deck and pacing.
Repeat the process with Regent. Start the run cleanly, then abandon it from the in-run menu. That should unlock Necrobinder. At this point, the chain is already doing exactly what makes it so convenient: every newly unlocked character immediately becomes the key to the next one.
Do the same one more time with Necrobinder. End that run, and Defect should unlock. Because Ironclad is available from the start, this means the full roster can be opened with four short runs total if your build behaves like the current guides describe.
That is the entire shortcut. No boss kill requirement has been reported for the five core characters, and no source in the current guide set points to a hidden difficulty gate or act-clear condition for basic roster access.

Ironclad is the starting character. There is nothing to unlock here. The only reason Ironclad matters for progression is that he is the first link in the chain. If you want the fastest roster unlock, Ironclad’s job is simply to open Silent.
Silent unlocks after you end a run as Ironclad. Based on current reporting, the game does not care whether that run ends in victory or failure. If you are still learning the UI, make sure you are ending a real run and not backing out before it fully starts.
Regent unlocks after you end a run as Silent. This is where some players waste time because the roster screen makes it feel like there must be a more demanding requirement. As far as current public guides show, there is not. Start the run, end the run, move on.
Necrobinder unlocks after you end a run as Regent. If you are doing the speed method, this should be your third short unlock run after the initial Ironclad step. The chain remains fixed, so you cannot skip ahead to Defect without touching Necrobinder first.
Defect unlocks after you end a run as Necrobinder. This is the final step for all core roster unlocks currently covered by public guides. Once Defect is available, you have the full five-character lineup that current sources consistently list for the game.

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If the next character does not appear immediately, the first thing to check is whether you ended the run from inside a fully started run. The second is whether you followed the chain in the correct order. You cannot unlock Regent from Ironclad or jump straight to Defect early.
After that, the most likely explanation is version variance. Slay the Spire 2 coverage is still settling, and current consensus comes from secondary guides rather than official documentation. If a later patch changes whether forfeits count, or if certain modes behave differently, standard solo runs with a clean start-and-end sequence remain the safest test case.
It is also worth remembering that some videos and community discussions mention other unlock layers, hidden rewards, or achievement-style progression. Those may be real for card pools, timeline rewards, or special content, but they do not currently overturn the much clearer agreement around the five core character unlocks.
The smart play is straightforward: if you want every character available quickly, do the four short prerequisite runs and unlock the whole roster first. Then start learning whichever deck actually interests you. Unless a future update changes the system, there is no good reason to grind full clears just to open characters. For now, the strongest practical verdict is this: Slay the Spire 2 appears to use a simple chain unlock, and the fastest route to all characters is to start and immediately end one run with each required class in order.