Our guild has been plagued by a hacker as of late and now they've struck ouor website.
First, I thought I recalled a way to ban by IP? Can you point me there please?
Admin --> Security --> Ban List
Second, they created pages of obcene posts on the forums, is there a way to mass-delete all messages by particular user?
The site is wulfpack.dkpsystem.com
Not that I know of, but here's some friendly advice.
Go to your Admin Panel. Go to the section that says Characters and Accounts. Click the link that says Website Accounts. At the top there is a checkbox that says "Authorization Required to create account". Check that box off.
If you do this, then you will receive an alert when people try to create an account that says the account name and asks if you want to approve, deny, or do nothing.
As it is right now, anyone with 30 seconds of free time can create an account on your site and troll your forums. It isn't hacking, and doesn't require any skill of any kind.