Just got this mail from the Wikia's staff team:
Thanks for contacting Wikia and letting us know about the troll on
Dr. Zhark Mobs Wiki. I have blocked him and reverted/deleted his remaining contributions.
If he returns in the future, you can report him to the Volunteer Spam Task Force (http://vstf.wikia.com ) for help with cleanup and blocking.
Hopefully there will be a little less spam/prevention work to do from now on.