I've gotten to floor 47 on my black mage solo. Yes, I have died a LOT. Yes, those luring traps are extremely deadly at the higher floors, especially since most mobs are immune to sleep. Yes, I believe I can finish all the way to floor 50. I'm currently at +30 weapon +24 armor.

. . .Those mimics are also pure evil, they are basically anti black mage. Sleep doesn't work on them. Bind doesn't work on them. Slow doesn't work on them. Heavy doesn't work on them. Fortunately virus and manawall work on them, but they still hit pretty hard. If you accidentally get 2 on you at the same time, that's almost a guaranteed death, even with a pom of witching because of potion cooldowns.