what about a spear. it would be equiped in place of your sword, not as a regular item. also it could be thrown, used underwater, and while on epona. so really, it would be more like a spear/harpoon/javalin/lance.
maybe you could get it really early in the game, before a sword, or maybe you just never get a sword. thatd be a fresh change. ofcourse, it could also be a deungeon item.

and i liked the chu-shooter idea

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