PermissionsEX issue

I'm trying to have a group with pretty much no permissions, who should also be unable to brake or place blocks, but after quite a few attempts, I had to run to you guys.

It currently looks like this:

Code:

New:
    default: true
    prefix: '&5-=[&dNewbcake&5]=- '
    permissions:
    - essentials.help
    - essentials.helpop
    - essentials.rules
    - -essentials.build.*
    - -modifyworld.blocks.*
    options:
      build: false
      rank: '10'

I've tried to leave out "build: false", the rank, and modifyworld/ess.build, but with no results.

 

Bumpy bump

 

if you use worldguard you can create a region and deny building in it

 

The thing is that the server is "private", but since the current players bring in friends every now and then, I cba to whitelist.
What I want is a group that simply can't do anything at all, in case someone uninvited stumbles on to the server.
Though it's starting to look like this is actually an impossible feature to have.