Still no update from MythicMobs since three weeks regarding their repository. So I still cant build this plugin...
However. The plugin works fine on 1.17.1 since the bug which prevents it from working only appears on 1.17.
So if you are using 1.17.1 BloodNight will work again :3
Also I am working on 1.0.0 for quite some time now and it will be amazing for you guys! So in case you are wondering why no new features are coming to BloodNight currently, its just because I am working on the new version of BloodNight.