On *:text:!Changeworld *:*: { 
  if  ($nick isop #forces-khan) || ($nick ishop #forces-khan) && ($2 isnum 2-138) { set %world $2 
    msg #forces-khan The world has been changed, type !world to view it 
  } 
}

On *:text:!world*:#forces-khan: { 
  if  ($nick isvoice #forces-khan) {
    notice $nick Current World: %world 
  }