All of which have this odd tendency to be deflected by either his armor, his shield, his cover, the implausible number of spells making him nigh-indestructible, the fact that his demonic patrons grant him a considerable degree of resistance to magic, or the minor detail that anyone who’s unwise enough to try getting within the reach of his sword is going to lend him their life energy until they can afford a Raise Dead spell.

You’re going to be here a while, folks.

At the top of the stairs (an equally defensible position to the bottom, and with a Wall of Fire occupying the top step on the staircase) is a massively armored knight in Hellknight plate of his own, shield in one hand and flail in the other, defensive spells making his armor glow further to the King-In-Irons’ permanent Detect Magic, who grins when he sees Bosch coming up the stairs, the King-In-Irons and Pedra (presently invisible, though not for much longer) behind him, and from behind the Hellknight they can hear the sounds of chanting - 

The King-In-Irons tosses his rock of silence over the Hellknight’s head and the sound cuts out. The King-In-Irons is abruptly audible as he speaks the words to his when-in-doubt enchantment, Hold Person.

The spell slides off the Hellknight’s armor - or, more accurately, the enchantment layered over the armor - as if it had never been cast.

Well, by this point Pedra’s singing is audible and her Human Bane arrows are deflecting off the knight’s armor, as the knight and Bosch (equipped with a Protection from Fire spell the night before) trade blows - 

 I suggest that you inform your superiors in the Order about this attack.

Slides off the armor.

The Silence'd rock bounces its way down the stairs, its aura overlapping with the one Oriol's toting, and the chanting resumes.

Dispel Magic.

 I Suggest that you go tell the Hellknights the estate is under attack.

And he withdraws down the secret passageway.

Did the Demicardinal tell him about all the traps in the passageway?

She did not, no! Her “You blithering idiot, they blocked the escape -” arrives unfortunately after the sound of his screams when the floor drops out from under him and lands him in a pit of acid.

As happens.

Indeed. Thanks to some very swift scroll-casting, she’s about twice her normal height, wearing armor made of solid ice, also somehow wreathed in flames, and glowing with divine power.

Human Bane arrows, Heretical greatsword, a lot of Dispel Magic.

It’s not a very long fight, no.

Then into the bag of holding goes her corpse (to be separated from its magical items later), the corpse of her Hellknight (once retrieved with a scroll of Telekinesis, that being presumably a worthwhile investment) and the King-In-Irons and a couple of Celestial Eagles can search the room for anything else useful, while - 

Aspex ditches his Silenced rocks, and -

Disguise Self, Glibness, and then a woman wearing the robes of an Asmodean priestess of rather higher rank than Carme Scarpo and an aura of absolute authority walks down the stairs, looks at the bloody mess below, and says - voice projecting over the sound of slaughter - “Carme Scarpo has been judged by Asmodeus’s law and held wanting.”

Wait, what?

Sure looks like there’s a Hellknight standing behind her looking imposing!

“The rest of you will be questioned to determine what role you played in her delinquency,” she says - 

It is the opinion of the King-In-Irons that Pedra can be trusted to handle the bullshit, yes.

By the time he finishes searching the room, the army has surrendered to their rightful superiors, thrown down their weapons (into the bags of holding!), and been ordered to their quarters, and the team can head down to Scarpo’s treasury, where she keeps the taxes collected from her domain -

Which Mira Mayapple, Jaume Vilaro, and Felip Zhen have in fact now finished looting, their bags of holding already loaded up with not just the gold and silver but with Zhen’s hasted zombie servants (which had done most of the hauling). Zhen tosses a flaming sphere up the stairs because screw Cheliax, then he and Vilaro crawl into bags of holding -

- and the King-In-Irons draws a scroll from one of his bags of holding and casts teleport.

The total time elapsed was one minute, forty-eight seconds.