Board Thread:Support Requests - Getting Technical/@comment-25404524-20171110231136/@comment-1757994-20171111004734

AbuseFilter warning messages can be any name in the MediaWiki namespace, although typically (not at Wikia) they are named, where   is a number or name that's meaningful to whoever administers AbuseFilter. However, you can name them using whatever convention you like.

At Wikia, most MediaWiki names are blocked from creation even by admins, so you'd have to name the message something like.

Then in the filter itself, enter the message warning name, without the MediaWiki: prefix, where it says.