5e Mystic soul knife question

[Me.Fox]

I think this is kind of a dumb question, but what mod do I use on the attack and damge of the soul knife's blades?

[furby076]

spell casting mod iirc

[leogobsin]

Soul knives are melee weapons with finesse, so they use either str or dex.

[Desteplo]

Str or dex

[Me.Fox]

Thanks for the help :D