The Philosopher's Stone isn't crafted. You earn it by passing a series of alchemy gates, twelve steps named after the stages of the alchemists' Great Work.
Each gate is a riddle. The riddles come from scraps of Lost Knowledge, and piecing a riddle together is the puzzle. This wiki leaves them for you to solve.
Once you hold the Stone you can cast circles in thin air. A better Stone makes casting cheaper.
On the way, alchemy also gives you:
- Salt lines that mobs won't cross at night.
- Sulfur vents that turn water into healing hot springs.
- Ore doubling, up to five times, and transmutations such as iron to gold.
- Block chains, like cobblestone to gravel to sand.
Gates are datapack files under data/<namespace>/alchemy_gate/, so a pack can retune them.