The Steel Shuriken (鋼の手裏剣 Hagane no shuriken) is a Shuriken that is introduced in Fire Emblem Fates. Slightly stronger than its iron counterpart, the Steel Shuriken is able to reduce the Strength, Defense and Resistance of enemy units post-battle, alongside increasing its wielder's Speed by 2. The Steel Shuriken does, however, come with a reduction to its wielder's ability to perform double attacks.
The shuriken (手裏剣) was a common throwing weapon for ninja, and its name can mean "sword hidden in the hand", or "the sword inside of hand". These were flattened, bladed discs that were thrown at enemies.
Ironically, shurikens mostly look like small discs with flat spikes protruding out the sides, so that it could slice while being thrown and spinning. The steel shuriken seen in Fire Emblem Fates looks much more like a kunai (苦無), which were diamond shaped knives that were originally used for farming and repurposed into weapons by some ninja.
- Furthermore, kunai were mostly used as close combat weapons for stabbing people up close, while actual shurikens were meant to be thrown.