Seriously, it is mod, that adds png image, that follows you and does a lot of damage on contact.
You can get stable version of the mod on the steam workshop page, or alternatively, download from the releases tab.
If you want latest and greatest changes, follow instructions below. But beware, that it may be unstable, cause data loss, and generally unpleasant experience.
You can get project via Github's web-page, or using CLI of your choice.
Also you can get it from releases tab, with compiled binaries.
Project can be built using standalone .NET Core 6 package or tModLoader's built-in .NET redistributable.
On this step it is preferred to use IDE like Visual Studio, Jetbrains Rider, or any other IDE of your choice.
tModLoader's developer guide is good starting point, if you are new to Terraria modding.
If you planning to do your own Nextbot, don't forget to rename everything, to avoid compatibility issues
And if you want to contribute to this project, glance upon my existing code, and try to follow it's conventions. Any help appreciated.