So far, there are 105 pages on the wiki, but those pages are mostly extremely primitive. They need more descriptions, pictures ( I've only found some high-resolution pictures of leaders and wonders in new expansion at the official website, more pictures of other cards are needed) and strategies. Feel free to edit, create pages and don't worry about if your edition is perfect. For even an imperfection is better than nothing at all and others may contribute to the pages you've created or edited thus improving its quality.
We have forums and discord chats of tta, but I believe it will never be too sufficient to have a wiki. For one thing, the complexity of tta requires a more useful tool to explain its gameplay, and a wiki serves well for it can conveniently redirect between links and has a clear guildline. Also, it can show different cards in different versions. And there are handbooks and discussions about tta, which may directly adapted into wiki pages.
Looking forward to your join in the editing.
