How to get a hallow scythe?

Hello there, I'm curious about how one might go about acquiring a hallow scythe. Now, I'm not exactly sure what a hallow scythe is, but from the name, it sounds like it might be some sort of mystical or enchanted tool. Could you possibly elaborate on what exactly a hallow scythe is, and then provide some guidance on how one might obtain such an item? Is it something that can be crafted, purchased, or perhaps found as treasure? I'm quite intrigued and would love to learn more.