Wikipedia:WikiBarbarian

A WikiBarbarian is a dangerous vandal who devotes their entire time to vandalizing articles. They often attack in groups and often do not stop at articles, but continue to pillage any unprotected page they can find.

Behavior
WikiBarbarians attack from within groups, and usually do not stop when reverted and warned. Although they are uncommon, they can cause huge problems for pages. They have been known to attack a page, then attack the admin who blocked them. They can usually overtake a WikiJanitor or a low ranking WikiPoliceman. They are also extremely fanatical to vandalizing, and will stop at nothing to pillage pages. They have also been known to employ sneaky tactics to vandalize pages, such as by making multiple small, discrete changes to an article. The messes they leave can cause a WikiFairy to faint.

Predators
The WikiBarbarian has but only one natural predator, the WikiPuma, who uses their sight and hearing to spot the article being vandalized. The puma cleans the article and fixes it, but the WikiBarbarian takes this poorly and will attack the puma, using its one true fear: flame. At this point the puma may use their vocalization to call for backup with others, police, knights, ninjas or sometimes even dragons. The puma purrs loudly when the adequate justice is served to the offender.