Board Thread:General Discussion/@comment-35301431-20130305231956/@comment-3335785-20130306002035

You cannot clear out an abuse log in much the same way you can't clear out an upload log. Due to the way wikis work with attribution, everything is page history is preserved, abuses included. Keeps us all honest ;)

There is an option to autoban those that trip a filter, although I can't remember if I saw it on a Wikia wiki or elsewhere. For help setting them up you can ask the VSTF probably on their spam of vandalism pages as I can't see an obvious abuse filter help page.

The page titles seem to suggest repeated use of a bot but the IPs are very different suggesting use of a proxy or possibly TOR, a way people can keep anonymity on the internet. I'd be inclined to go with a proxy in this case, which I don't think you can do much about. I assume you have admin tools, in which case Special:ProtectSite can be enabled in extreme circumstances for a maximum of 12 hours. Alternatively you can ask staff to disable IP editing, although I don't think your wiki's vandalism warrant that currently. I would suggest simply improving your filters for now, there are wikis with far more active abuse filters.