In the past few years, we have covered plenty of cool dice games and holders here. This 3D Printed Dice Holding Dagger is also worth a look. It has room for a standard set of polyhedral RPG dice. The removable pommel gives you additional storage space.
TabletopStor3d is selling this on Etsy. You get 36 colors to choose from. You can customize each part of your dice dagger.