How do I get into the stronghold?

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.

Proud of it, too.