Grimmchild it's not a bad charm for it's price costing just 2 notches but the little extra damage your familiar provides it's not worth the non-stop noise it makes while he follows you.

This is not the only part the sound design of Hollow Knight gets on you... the shitty bug Zod on Dirtmouth, the charm seller and the buzzsaws on White Palace all fills the atmosphere with non-stop noise which wears you after a while. It's like whoever made it never had to endure the sound for more than 30 seconds and though it would be cool to have it there. On loop. Non stop.