What is the best way to make a minecraft diamond sword(in real life)?

I'm trying to make a mincraft diamond sword for an 8 year old boy. He is very harsh on his toys, especially weapons, which he likes to use till destruction and play fights with all the time, usually with other children as well as adults. So I'm looking for materials that are both soft enough for a child to use(and not seriously hurt anyone with) and hardy enough to withstand the amount of the abuse it will surely get. I was thinking of doing it like a boffer sword, with a type of foam (I still don't know what the best type would be) and using the duct tape of the correct colors to bind it and waterproof it. But I'm not sure what type of base material would be best so it is both soft, but hard enough to cut the sword shape and make sure it keeps its shape.
I would appreciate any suggestions.
Thank youWhat is the best way to make a minecraft diamond sword in real life

I'm actually not sure what materials you would use for a minecraft diamond sword, but I do know that you can just go and buy one at the store! They're actually really sturdy and don't break all that easily. I've had mine for quite a while and my two little brothers bash it up all the time! It's durable enough for most people… But for some, it's not enough. I'm sorry I don't know any materials but I just wanted to add that you can purchase a pretty nice diamond sword from the store that's made pretty strongly. It's like 15$ in the US.

We'll they have them at local grocery stores where I live but I'm not sure just check in the toys section I'm not sure how you would make it I'm not very creative

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