In Haunted Castle? I don't remember a rosary. Whip, Morning Star, Sword, Torch, Bomb, Boomerang, Pocket Watch, and pew-pew-pew Cross. I don't recall a rosary. Now, I know Castlevania was developed alongside Vampire Killer, and a lot of sprites from that game can be found in Castlevania's data. However, I didn't see anything about the rosary as a weapon in VK either.

I saw a video of a guy hacking LoI, showing off a Rosario subweapon, but that's all I've been able to find about any such thing and that's obviously unrelated.
