SLAY THE SPIRE / PROGRESSION

Ruby Key

A special key acquired at a Rest Site by selecting Recall.

QUICK REFERENCESlay the Spire 1Reviewed 2026-10-28Reference / noindex
Original schematic Volpedia category artwork
OVERVIEW

What is Ruby Key?

A special key acquired at a Rest Site by selecting Recall.

This reference covers gameplay decisions in the original Slay the Spire. Character-specific options and relic synergy can change how useful an item is, so consider your current deck, health, upcoming enemy and available resources before applying a strategy.

PRACTICAL STRATEGY

When and how to use it

Plan when you can afford to trade a heal or upgrade for access to Act IV.

COMMON MISTAKES

What to avoid

Taking the key at lethal HP may not be worth the objective.

CONTINUE ON VOLPEDIA

Related topics and walkthroughs

PROGRESSIONAct IV Unlock

Requires prior achievements with the core original characters before key collection becomes available.

PROGRESSIONAscension Ladder

Rising difficulty levels increase challenges one step after another.

PROGRESSIONCard Unlocks

Character progress awards additional cards and relics in later runs.

PROGRESSIONCharacter Unlocks

Progress opens additional original-game characters and their card/relic options.

PROGRESSIONCorrupt Heart Victory

Optional endgame objective for capable decks that collect the three keys.

PROGRESSIONEmerald Key

A special key earned by defeating a Burning Elite.

PROGRESSIONFirst Victory

Defeating the Act III boss ends a standard successful run before optional Act IV.

Back to Progression

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.