Elixir of the Spent Year

Heavy brown glass, the contents thick and slow to tip, sealed with wax cut through by one straight line.

The drinker begins a single task at dusk and finishes it by dawn, however long it would honestly take, to a limit of one year of uninterrupted work: a library copied out, a language learned to fluency, a shaft dug, a trade mastered, a wall raised. The work is genuine and the drinker remembers every hour of doing it. The drinker's body ages one year for each year of work spent. Will not create magic, will not grant experience, and will not do work the drinker could not have done in the time.