[Never forget the sparkles Envy, that way lies madness.]
A forbidden jutsu is just that, something that's been forbidden. Some bring people back from the dead, some are just highly deadly, and others do things totally unrelated and are banned for other assorted reasons. But if you've fiddled with your soul using jutsu, it's pretty much a guarantee that if someone knew about it then they'd probably make it forbidden.
[Text | permanon]
A forbidden jutsu is just that, something that's been forbidden. Some bring people back from the dead, some are just highly deadly, and others do things totally unrelated and are banned for other assorted reasons. But if you've fiddled with your soul using jutsu, it's pretty much a guarantee that if someone knew about it then they'd probably make it forbidden.