Dench sees Uri and Direcris and their wounds. He casts Prayer of Healing at 4th level on all his allies: 34. "Lathandar, fill us with thy healing light!"

And Lathandar delivers. 

Sir Gadston

Gadston points towards the pale woman and says "I call the light down upon you" Gadston casts Guiding Bolt at 4th level:

Hit: 26

Damage: 23 (radiant damage)

 OCC: for some reason it's not showing up on my end....oh well

Direcris nods his thanks to Dench, then casts Hold Person at the Pale Lady. (WIS 16)

(Prayer of healing takes 10 minutes to cast, if you healed that amount please remove it)

Guiding Bolt v Plae Lady, 19 to hit, 20 radiant damage

Direcris's spell fails to affect the undead Pale Lady.

(Pale Lady 45 damage) 

She continues to try to deal damage despite the radiant light halting her healing abilities.
Longsword v Uri, 14, 6 slashing damage
Longsword v Dench, 17, 6 slashing damage

Feeling that the end is near, and rallied by Dench's infusion of magical vitality Uri attacks with renewed vigour.

Attack: 21 Damage: 7
Attack: 30 Damage: 13
Attack: 18 Damage: 8

OOC: Steedling, I'm sorry I missed the casting time on Prayer of Healing. 

Her blade still chipping at his armor, Dench casts Healing Word at third level for 5, aiming for all his allies. He'll also introduce Dawn to the Pale Lady: 9 for 7.

Sir Gadston

"This pale woman seems to want to cling to unlife like sheep droppings to wool," Gadston says. "We will need to rest after all this is done I wager."

With that Gadston will use his bonus action to cast Branding Smite at 4th level, then attack the Pale Woman.

Attack: 10
Damage: 12
Smite Damage: 10

2nd attack: 18
Damage: 9
Smite Damage: 14

Direcris hits with Chill Touch again. Attack: 27 Damage: 10

The Pale Lady is not able to survive the next onslaught of attacks as she is reduced to a pile of dust. Silence falls around the group in the hallway with only the crackling of the oil lamps to fill the air.

Uri sits on his haunches and licks his wounds. He can feel his eyes heavy with weariness.

Direcris slumps against the wall. "I can put up the Hut. But do we want it in here?"

Dench, hoping not to be interrupted, casts Prayer of Healing at forth level: 15: "As we are, knowingly or not, always on your mission, Lathandar, strengthen us we plead." He'll also look at his hammer Dawn, frustrated by its and his inability to rise against their enemies. "Let us see what Lathandar grants us. Perhaps a short rest will be enough?"

"We've seen two rooms. Was there a third? Any sign of the book, with its crescent constellation?" he says.

Sir Gadston

Gadston will quickly survey the room and walk the perimeter of it. 
Perception: 20
If the danger seems to have past for the moment he will return to the party and tell them anything he has seen.
if there are no other exits besides the window, and the door, Gadston will secure the door the best he can and says:

"This may be the best place for now. But, that window is an entrance and exit for vampires and the like so we must be on our guard."

There don't appear to be any exits aside from the window and the door in which you entered. If Direcris wishes to summon a hut, you can attempt a short rest. Looking in the area immediately around you, they does not seem to be any book that matches the description you were provided. 

Direcris moves toward the back of the room and sets the Hut up as far from the door as possible. He waves the others in and sits down with a groan. 

"Thank you, Direcris," Dench says. "You are skilled." Dench closes his eyes to consider the ways of Lathander. He listens and tries to stay alert.