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Philosopher's Stone

Keep it for the linked special mountain or late-game gate; losing it can block that progression path.

Main useKeep it for the linked special mountain or late-game gate; losing it can block that progression path.
When it mattersUse when your gold, ore, gem, or transmutation economy is holding back upgrades.
Progression roleRequired for a special mountain or late-game gate.
Best follow-upBest Artifacts
SourceAlchemy reward path.
RequirementUnlock Alchemy prestige, buy 8 Scientists, then keep using Alchemy.
Player noteThis is the common 7/8 Great World Spire blocker; Forge Artifact and dens do not substitute for it.

Passive: Transmutation rituals have a 0. 1% chance per Scientist, Runesmith and Stonecaller, a 2% chance per tier of Ritual Power, and a 0. 05% chance per Alchemy Research, to double their results.

SoundPreviewLength
Artifact Choice3.2s
Artifact Gained5s