"How'd it go?" Seelah asks, when she gets back. 

"Good! We got the glasses working. I think they'll be useful." She offers them to Seelah. 

Seelah peers around. "Huh...interesting." 

"Probably the effects will be more impressive with, like, demons around." 

"Probably. Being able to pick tieflings and aasimars out of a crowd isn't that useful. But it's a good thing there aren't any demons around for them to work on." 

"For now. The assault on the place we found out about at the Tower of Estrod is pretty close at hand." 

"Yeah. You ready?" 

"Yep." Not that she had as much preparing to do as the non-spontaneous casters. "You?" 

"Always." 

The preparations for the assault were limited, largely, by available resources, but they were still pretty thorough. Archers on every rooftop, barrels of alchemist's fire stolen from the cultists themselves positioned where they were likelier to do good than harm, every entrance to the inn itself from the courtyard both barricaded and defended. 

The evening grows dark. 

The evening grows quiet. 

The first sounds of the approaching cultists can be heard. 

Guess who has aaalchemist's fiiiiiire!

That would be both of us. 

WHAT. 

Okay, this is unfortunate, but: 

1) We have more alchemist's fire than you do.

2) We want this particular battlefield to burn down and you don't. 

3) Since when have demon cults given a shit if a few cultists go up in flames?

Oh, to be sure. Nobody on the defending side is under any particular illusions about who has the greater alchemist's-fire-related advantage. 

They weren't relying on it. 

Hey, you know what Woljif prepared today? 

Grease. 

Just Grease, as many times as possible. 

Cultists find themselves slipping and falling off the places on the roof where they've propped their ladders, and where a battering ram has downed one of the gates. Not all of them, of course; some manage to make their way past the slippery places and towards the defenders--

And some of them then fall asleep. 

And some of the ones that fall asleep can in so doing fall off a roof and break something! Which does unfortunately un-sleep them, but what can you do. 

...Which is not at all to say that the battle is easy. There are a lot of cultists. Also, they can throw their firebombs from outside the courtyard. 

Lusilla is really useful. She has spells of her own, albeit none of them are Grease. She is also a daunting melee combatant, with her inhuman strength and ability to regenerate. 

But the use she feels most keenly is the ability to dimension door over to a downed guy and scoop them up before a cultist can finish them off. She--doesn't manage to save everyone she goes after that way. But every one she does save is someone who would definitely have died, without her.