[calorie]

What about blocking certain IPs for a bit? Maybe something like the following at the top of the vB init.php file will do:

$troll = '123.456'; // a or a.b of a.b.c.d

if (isset($_SERVER['HTTP_X_FORWARDED_FOR']) && preg_match('/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/', $_SERVER['HTTP_X_FORWARDED_FOR']))
{
	if (preg_match('/^(' . preg_quote($troll) . ')\./', $_SERVER['HTTP_X_FORWARDED_FOR']))
	{
		exit();
	}
}