put in random level for example a supersized wolver, or trojan, or zombie
the atk pattern could be the same or like another slight upgrade( t1 giant wolver with t2 atk pattern; t3 with more dmg)
it doesnt have to be as serious as JK, but between jk and normal jelly strength monster
There are only 4 bosses, mini bosses will boost up and intensify other none boss floors
i kind of put this idea on my boss post, see "boss idea", should be along the lines of "Clockworks Angel".