Wiki URL: https://opendominion.miraheze.org/
Your custom domain: https://wiki.opendominion.net/
Do you want Let's Encrypt: Yes
I've set up a CNAME record (in Cloudflare) and disabled the HTTP proxy for this particular DNS entry, as instructed on the 'Custom domains' page here: https://meta.miraheze.org/wiki/Custom_domains
Please let me know if you need anything else from me.
Thank you! ♥