Fionna's Crystal Sword is a sword Fionna owns. It was given to her by Prince Gumball, who was actually Ice Queen in disguise. In the episode "Fionna and Cake," she attempted to use it, though, it froze to her arms and wrists. The crystal sword is actually a form of ice.
It has multiple shades of pink all over it, and it is made out of a form of ice. Its edges are very straight and precise.
- The sword is portable. As it is possible to grow and shrink by command. Sort of like a lightsaber.