Board Thread:Questions and Answers/@comment-118.211.8.204-20150302141811/@comment-6697950-20150915044444

As the person above has said, The Gleam Eyes was a normal floor boss, not a quarter boss. I'm astounded by how people keep confusing the two. So no, The Gleam Eyes was from from being a difficult boss.

You're referring to The Fatal Scythe. And none of the boss' stats or numerical HP have been revealed.