Amaranthine Star

This one was actually based off of a suggestion from Reddit. Basically he wanted a greatsword that could launch a shuriken by swinging the blade.

Sword Form: Fairly standard Greatsword-type weapon

Secondary Form: The blades separate, allowing a shuriken stored at the base of the blade to be launched out using the force of the swing.

Shuriken: This is the most interesting part of the weapon. The Shuriken is attached to the sword via a cable that naturally extends up to 20m as the shuriken is launched from the blade. The Shuriken starts out in a collapsed form, then extends into a more standard weaponized form once it leaves the blade. The cable allows the shuriken to be retracted back into the sword after throwing it, and naturally the shuriken turns back into its collapsed form when doing so. The retraction can be stopped just before it gets back inside the blade and the shuriken used to extend the reach of your swings with the sword. If the shuriken catches an opponent, the retraction can be used to either pull the enemy towards you, or vice versa. The Shuriken can also be used as a grappling hook, angling the blades differently to maximize it's ability to catch ledges and the like.

The sword holds 2 spare shurikens and can detach the cable from the currently loaded shuriken if absolutely necessary. These spare are only used as emergency back-ups in the event that the main shuriken gets destroyed or caught and cannot be retracted or otherwise quickly retrieved.