Thanks Kocka for letting us know of the situation.
The last admin edit was in September 2015, so this wiki is eligible for adoption, see Kocka's link for more info on how to start that process. In the meantime, please do let us know if anyone else needs dealing with via our report page
When a wiki doesn't have any admins left, adoption is the way that the community chooses it's new admins. What normally happens is that the active users on the wiki come together and have a discussion on who should be the admins (that can be as many people as you want, most wikis have 2 or 3 just in case one is busy). Then staff has a look at the discussion and gives the rights to the right people. Have a read of the adoption page for more info, and please don't hesitate to ask any other questions you may have.
Looking for live help? Then join us for an upcoming webinar to chat with staff and other Wikia editors. You can also check our Staff blog to keep up-to-date with the latest news and events around Wikia. Lastly, check out the Wikia Video Library, where you can find premium licensed videos to add to the wiki.
All of these links are a great way to start exploring Wikia.