Magic/Fantasy:
* The witch cast a spell to make the flowers bloom in winter.
* The ancient book contained powerful spells that could summon creatures from other realms.
Weather:
* The meteorologist predicted a spell of hot, dry weather for the next week.
* There was a spell of rain that lasted for three days, flooding the streets.
General:
* The artist's use of color spells out a sense of joy and optimism.
* The doctor's calm demeanor spells hope for her worried patients.
* The long journey spells trouble for the weary travelers.
Idiom:
* The lack of funding spells disaster for the project. (Means it will likely fail)
These are just a few examples. The meaning of "spells" can vary depending on the context.