Has Anyone Encountered Lunar Biome Bosses?

For the first event, it was mentioned that “...in addition to [lunar enemy encounters], there are also difficult “boss” opponents which appear only when you are a much higher level. These bosses, while extra difficult to battle against, will drop better rewards!”

I have had a level 20 Lead since the first event, and still haven’t encountered any bosses, and the second event is nearly over. I was wondering if anyone HAS encountered them, and could say what they are and what they drop. 

I have!

I've gotten the charged bear, charged boar(boar drops boar tusks), giant rat, and some more.

Oh, so those are the bosses? I figured they were just enemies at comparable levels to high level leads (similar to how I imagine lower level leads can get trophies off lower level lunar enemies)