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Like its cousins, the humble stone knife and bone knife, the primitive seashell knife has not much use as a weapon. But while being one of the simplest of tools, a knife is also among the most useful. It is able to perform the same tasks as a metal knife, but is less efficient. However, it only requires seashells to make.
You will need a knife to make a variety of things, including clothes, other tools, basic weapons, and protection. It also helps you gather things like apples, bananas, grapes, and tomatoes at a faster rate.
See also: stone knife, knife, bronze knife, bone knife