its possible to get cave like 50lvl? oh my gash its so hard o,o any tip for begginer?

Does someone has a tactic for this boss? I am way ahead on cave levels and have a lot of progress in the challanges but i am not able to beat him.

I don't even get enough dark mana for 1 upgrade per ritual at this point. Stuck on stage 35, but honestly usually reset at stage 21 or 26 because its way faster than pushing higher. 5 minute runs for 2k dark mana are better than 2 hour runs for 4k dark mana. I really wish there was an auto ritual option now because all I really do is hit ritual than wait a few minutes then do it again etc. Feeling burned out, and thinking of quitting till there is an update that makes thing less tedious. /rant...

Above unlock is bugged, it dont always register kills of overseers that manage to use their fury ability, spent many hours now trying to unlock it, but it have happened several times in each run i have done to try and unlock it. Really wish it could be done over many runs like other unlocks i have done could, then maybe it is doable even with it being bugged like this....

I had power go out while game was running. Now it's reset EVERYTHING! Any ideas to fix this?