Riptide is a xiphos made from Celestial Bronze. It is usually in the form of a pen, but by taking the cap off, it transforms into a sword. If lost, it always returns to the wielder’s pocket in pen form. Touching the cap of the pen to the hilt instead of the tip of the blade allows Riptide to be used as a normal pen. It is deadly to gods, Titans, and monsters, but it simply passes right through any mortal without harming them.
Sword of Heroes
From: Kung Fu Panda
Wielder: The fourth brother, Po
This is a legendary halberd that can split into two other weapons: a dagger and a broadsword. According to legend, the sword was forged by a blacksmith whose three brothers, wielding each of the three swords the Sword of Heroes represents (halberd, broadsword, and dagger). His brothers were defeated in a battle against giants, but he forged the Sword of Heroes to honor each of them and used it to defeat the giants. In Kung Fu Panda, it is on display in the Hall of Warriors, and it is said that the sword is so sharp even a glance will cut you.