It's pretty straightforward, really, at least if you're lucky enough to get Halpmeh and Crystal Ball.
Brought Fire Heart as the preparation, with Fireball magnet as well.
Killed the highest level enemies I could on the top floor with Bludtopowa + Fire Heart (that combo is very, very powerful) and barely managed to get to level 10 before going down, having to use some blood pools to finish off some enemies.
Didn't worship any deities in the top floor, since I didn't get very good ones.
On the lower floor, immediately worshiped MA (who gave me 100 piety because of all the magic I had already cast) and got mana leak right away so the bosses wouldn't get the magic resist.
Killed the goblin (I can't remember the name of most bosses, so I'll just refer to them by the monster type) with Bludtopowa + 2 mp Halpmeh + Crystal Ball (insane combo right here) and wraith with fireballs. I don't remember for sure, but I think I used whoopaz on Frank, and finished him off with halpmeh.
And that's pretty much the gist of it, fireball for Bleaty/wraith boss/bandit boss/warlock boss/Kinissch, halpmeh for the others. I had to use a single mana potion (except for some before because of Patches) against the warlock boss, but other than that I usually finished each round with a few tiles to spare.
That which is not dead may eternal lie, and with strange aeons even death may die.