[Tigairius]

As Dusty said above, you could delete the files in the accounts folder. I have done this before, but I haven't tested it multiple times, so I'm not sure if it's still working. If you give the NPC-Server rights to the accounts/ folder temporarily you could use a script to scan & delete the accounts folder. Also restart the GServer & NPC-Server once you're done for changes to take full effect. Your rights & everything will be gone though, so make sure the server owner is present to re-add your rights. This method is also highly unrecommended unless you have a great knowledge of what you're doing.