Silent voice cloudsplitter, is it worth it?

https://preview.redd.it/cf7ckeidp35g1.png?width=1768&format=png&auto=webp&s=f95905a3e20a48da472de49e81d7f0a8981920b1

Hey so i have 1 harmonic core and this cosmetic sword dropped today. Im not sure if its worth it but it looks cool to me. Whats your opinions on this? Or should i probably leave my core until i found a 2nd one for an outfit instead?

Also can this be applied to any longsword then? not sure how this works, Thanks!