Retry

This is a mod to let you start a custom run from any node on a run from your run history. Have you ever thought 'damn I died but I want to see what could have happened if I chose a different path there?', now you can. A couple things, its not a perfect recreation as if you played the exact same way on a custom run up to that point, things like the deck cycle are rolling counts that continue adding on every combat, and that is not saved in your game save (it could be added as a feature for runs that you play with the mod active, but it cannot ever work for previous runs since the data just isn't there, unless I'm just dumb and missing something). You can enter from the end of a failed run, or from the run history page in the compendium (this pairs well with my run table mod which lets you search for runs and filter by different things to get a nice table view of the runs). It can also be accessed from within a run and will abandon your current run if you choose to start a new one.
If you have suggestions or bug reports add them as issues on the GitHub repo and I can get to them.
The rest of this is information about the mod generated by claude, so it's probably right, but no guarantees:

What it does

• Adds a View Acts banner to the Run History page, the game-over / win screen, and any run history visible mid-run.
• Click it to open a visual act-map browser. Hover any node to preview the inventory you'd reload with.
• Click a node and Confirm to drop into a fresh same-seed run at that floor with your historical state.
• Treasure rooms reload with the same relic that was originally offered.
• Multiplayer runs open with the right map (player count affects map gen). Click the top-left character portrait to swap which player's inventory + path you're viewing.
• The in-run timer starts at a sensible offset (proportional to floor position, or the full original time if you pick the death node) instead of 0:00.
• Custom abandon prompt with three options: back out, abandon + save (writes a normal run-history entry), or abandon without saving (skips the history write so iterating doesn't fill your history with noise — that one wants a click-again confirmation).
• The new run is flagged Custom so it doesn't end up on the standard / daily leaderboards.

Known limits

• The seed reproduces the map and most encounters, but combat-internal RNG (shuffles, crit rolls) can diverge unless the mod recorded a snapshot for that floor during the original run. Most of the time it's exact; sometimes it's only approximate.
• Saved snapshots are written on the fly while you play with the mod installed. Runs played before installing the mod won't have them.
• STS2 disables achievements while any mod is loaded — uninstall if you're chasing those.

Install

If you're using the STS2 Mod Manager, just click install through it. Manual: extract the zip so the folder structure is 
<game>/mods/Retry/{Retry.dll, mod_manifest.json}.

• Mac:  <game>/SlayTheSpire2.app/Contents/MacOS/mods/Retry/
• Windows/Linux:  <game>/mods/Retry/

Then launch the game and enable Retry on the in-game Mods screen.

All my STS2 mods

• Retry — this mod.
• Run Table — searchable table of your past runs. Pairs with Retry: find a run in the table, click in, click View Acts, replay any floor.
• Enemy Cycle — see enemy move cycles.
• Timeline — in-combat timeline of every event.