This plugin turns obsidian into crying obsidian when hit by a sword.

If you have a permissions plugin, make sure your players have the permission "cryingobsidian.use"
This resource is part of my custom series. You can view the full list here, prefixed by [Custom]. This series comprises of custom requests from server owners, where I help them out for free and in exchange, I keep all rights to the resource. I am releasing them here for any other server owners who can find a use for them.