How do I get into the stronghold?

Exactly how much do these monsters deal? O.o
Sorry for my ignorance about this.

If you go deep enough you're looking at the ability to 2-hit a Shadower with MG, 5000 defense, and 10 thousand HP.
I'm laughing at the fact that bishops would even go there since it's such a god forsaken pot burn compared to their LHC rope leech. I've had bishops, but they're the kind that are super rare, also known as your attacking bishops.