SLAY THE SPIRE / PROGRESSION
Progression
Unlocks, keys, endgame and post-run improvements.
10 entries · Reviewed 2026-10-28
VOLPEDIA ORIGINAL GAME ENCYCLOPEDIA
Progression reference library
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10 of 10 entries · Original Slay the Spire 1
Progression · REFERENCE
First Victory
Defeating the Act III boss ends a standard successful run before optional Act IV.
Progression · REFERENCE
Character Unlocks
Progress opens additional original-game characters and their card/relic options.
Progression · REFERENCE
Card Unlocks
Character progress awards additional cards and relics in later runs.
Progression · REFERENCE
Ascension Ladder
Rising difficulty levels increase challenges one step after another.
Progression · REFERENCE
Ruby Key
A special key acquired at a Rest Site by selecting Recall.
Progression · REFERENCE
Emerald Key
A special key earned by defeating a Burning Elite.
Progression · REFERENCE
Sapphire Key
A special key acquired from a chest in place of its relic.
Progression · REFERENCE
Act IV Unlock
Requires prior achievements with the core original characters before key collection becomes available.
Progression · REFERENCE
Corrupt Heart Victory
Optional endgame objective for capable decks that collect the three keys.
Progression · REFERENCE
Run Review
Learning from losses by checking route, card picks, potion use and boss readiness.
Independent Volpedia editorial resource, not affiliated with Mega Crit. Original game (Slay the Spire 1), reviewed 2026-10-28. Slay the Spire 2 has separate rules, cards and characters and is not included here. Category graphics are original conceptual illustrations, not game screenshots or actual card artwork. Detailed numerical card costs, damage, upgrade effects and drop percentages are omitted where not individually checked. Editorial verification records are stored separately from public articles.