Belmarniss can now sorta muddle along in the local common thanks to aggressive use of comprehend languages to hand-translate books after roping a local into teaching her the alphabet. Also she hates teleport traps with every fiber of her being. Also she has figured out at this point that she somehow leveled in sorcerer instead of wizard during the business with the pirates and has no idea why that happened or whether it will happen again. And she has sold this stupid arrowhead to two different curio shops and given up as it seems to be cursed. And she just needs to keep doing what she does, she guesses, till she can teleport herself home. The Yawning Portal is a nicely ironic name.
Garrus fills one of them with arrows, but she doesn't go down; he swears under his breath. She and her partner make it to Jojo and start jabbing at him. Most of their attacks miss, but one connects; there's a prickle of negative energy over everyone's skin.
The last three vampires are hanging back by the statue, throwing shuriken at Deekin and Belmarniss. A couple slice into Deekin, but he ignores them and keeps singing.
She absorbs shuriken damage into her reservoir and turns it into scorchier rays and magicer missiles.
Jojo continues doorstopping and beating the hells out of the vampire monks, who, as they evaporate, return to sarcophagi set into little shelves on the wall. Eventually the party runs out of monks, and Jojo takes the arrow-stake out of his pocket and goes along the wall, staking each in turn.
This time, after each kill he bows his head for a moment and his lips move silently.
Once that's done, he returns to the group. "There are two exits to this room, both locked - should we check them now, and see which one the key fits, or does anyone need healing first?"
"All right."
Jojo goes to try the key in the northern door, then stops. "No keyhole, just a socket for some kind of orb."
He tries the key in the eastern door, and it opens. He enters the room cautiously, then waves the others in. In the center of the room is a raised platform on top of which lies a celestial of some stripe, contained in a field of pulsating red light and hooked up to a diabolical-looking machine by a blood-filled tube.
"Are you here to free me?" she asks hoarsely.
Jojo squints. "I'm picking up an aura of evil from the device and from the field around her, but not from her. She could have Nondetection, though... Deekin, can you dispel any magic on her?"
"Yup okay we're here to free you, do you know how this all comes off?" Belmarniss asks, inspecting the machine.
The machine has a big red button, and a slot where a lever could be inserted.
"The button tells the machine to drain my blood," the celestial says, "and the High Priest puts a lever in that slot when they want to turn the machine off and clean me. I think it has to be a specific lever, though, it has tines in odd places."
"I don't think I could describe a three-dimensional key verbally even if I wasn't missing so much blood," the angel apologizes. "The High Priest's chambers are down the hall - I saw a cloud of mist go that way a little while ago, you might be able to catch him while he's still re-forming?"
As they approach the High Priest's chambers, they hear swearing and spellcasting.
Belmarniss signs this information to Deekin, whose comp lang is presumably still working.
Before they can open the door to Sodalis's chambers, it flies open on its own, and Sodalis comes storming out, shrouded in swirling darkness. "Pathetic mortals! You shall fall before the might of V-"
Garrus shoots him in the chest. The vampire hisses loudly, channels a wave of negative energy over everyone present, and begins casting a long-range Harm.