Wikia has removed the Monobook theme as an optional skin for the Wikia site. Russ3Z and I are testing out a new ccs skin called PseudoMonobook. This skin is not available to be used as the wiki default, so each wiki user account has to set it up to use it. Following is a link for instructions on how to install PseudoMonobook: https://dev.wikia.com/wiki/PseudoMonobook
Here is a link to the recent edits page, here you can find examples of how Russ3Z and Medakan performed their setup: http://wotmud.wikia.com/wiki/Special:RecentChanges
This does seem like the best replacement so far for Monobook, we will continue to appraise the situation and if any better options become available we will keep all of you contributors and wiki users in the loop.
Happy Contributing!
Medakan