Why is my giant's sword dealing the same damage as my shadow fury?

[AKIL1_]

I thought that by purchasing a giant's sword, my damage would at least increase by 50%. I was shocked to see that it dealt the same amount of damage—if not less—than my Shadow Fury. What's the issue?

Here's my account :
https://sky.shiiyu.moe/stats/AKIL1_/Kiwi

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