Invisibility

"Invisibility sounds … safe," Sandra said.

"Illusion spells usually are," Fiora said. "Master Valoi loves them. Okay, I will cast invisibility on myself, and you'll tell me whether or not you can still see me."

"Sounds good," Sandra said.

Fiona opened her spell book to review the incantation and instructions. The worst case scenario was that she'd spend a few minutes looking funny. She read off the correct words, stumbling over the pronunciations as best she could, and felt a discharge of magical energy as she cast the spell.

"Well?" she said after she finished. "Did it work?"