Stardrops are extremely rare and valuable items that permanently increase your maximum energy. There are 7 Stardrops in total, obtained from various sources:
- Reaching Level 100 in the Mines.
- Marrying a spouse (given by them).
- Reaching max friendship with your pet.
- Purchasing from Krobus for 20,000g.
- Purchasing from the Stardew Valley Fair for 2,000 Star Tokens.
- Catching every fish.
- Donating all artifacts and minerals to the Museum.
Collecting all Stardrops is a significant late-game goal and a requirement for Perfection.