The Windhovers' Call

Frandal's first arrow shatters against the stone wall behind the wights; his second arrow plunges into the wight's mid-section but, somewhat surprisingly, doesn't seem to harm the creature as much as one would expect. 

Everyone: Combat round 1 has concluded. Both wights begin the round engaged in melee combat with Kurt. W1 has lost 25 hit points (10 fire damage from Arissa; 8 fire damage from Xellos; 7 piercing damage from Frandal) and W2 has lost 37 hit points (20 fire damage from Arissa; 17 fire damage from Xellos).

ROUND 2

Arissa and Kurt, please take your next actions. 

Kurt swings his swords again at the wights(W1).

Attack: 27 Damage: 7

Attack: 21 Damage: 9

Bonus:Attack: 19 Damage: 11

Kurt's scimitars successfully slash the wight three times over. The second attack (with the non-magical blade) is noticeably less effective than the other two attacks with the magical scimitar. The first wight (W1) is severely wounded but remains standing; a look, part desperation and part renewed fury, crosses its face.  (Kurt causes 22 points of slashing damage to W1 because damage from attack #2 is halved). 

Arissa, your action is next. 

Xellos says, "Fear our fire, monsters, for we cross the streams!!" (One went up the stairs, one across :P )

Arissa directs some vicious mockery at the first wight. "What happened to your face? Did you forget to put anything under the skin?"

Damage: 6

(WIS DC14)

The first wight seems to have lost its interest in Kurt. It turns and begins to make its way toward Arissa. (WIS saving throw for the wight: 14)

Xellos: Your action is next.

Xellos points a finger at W1 and says, "Dust to dust!"

3 glowing bolts fly towards the wight, hitting him simultaneously 

Magic Missile Force: 2 2 4

The first wight absorbs the damage from Xellos's magic missile spell and, despite the extensive damage it has sustained, continues its approach toward Arissa. The next action belongs to Ozum. 

Opportunity attack for the Wight leaving my reach

Attack: 22 Damage: 10

The wight falls to its knees, and its longsword clangs sharply against the stone floor. Its glowing eyes, just before going dim, lock onto Arissa's eyes, the last thing it sees before collapsing face down. 

(W1 has been slain; the only remaining enemy in the cellar is W2, which stands in space # 11). Actions remaining in this round: Ozum, DM, and Frandal. 

Ozum will again evoke chilling magic from the air casting frostbite on the remaining wight.

Damage: 3

Con Save 14, disadvantage on the next attack

(CON saving throw for the last wight: 4; it sustains 3 HP cold damage)

The last wight, grasping the hopelessness of its situation, chooses to disengage and ascend the stairs, which allows it to disappear from view.

The five of you look around the cellar, where you see the remains of six undead creatures: five skeletons and one wight. You also are able to make sense of the shattering noise that announced your presence. Attached to the door of the wine cellar is a length of light rope that is connected to a small wooden stool that is now tipped over on the floor. Next to the stool is a large area covered by glass fragments. Seemingly, when Ozum pulled the door open, the wooden stool (which had several bottles perched on it) tipped over and thereby caused the bottles to break when they struck the floor. 

Behind you is the wine cellar and secret entrance; before you is the set of stairs that leads to the ground floor. 

EDIT: The Wall of Fire was still in effect at the time the wight ascended the stairs; so it takes another 20 points of fire damage before leaving the cellar. 

Ozum looks at the broken glass dejectedly. "Sorry, I should have been more careful. We have to move, the one that ran will certainly alert any others so we cannot stay here." He reaches into his rust colored pouch and pulls out a furry ball.

Bag of Tricks (Rust): 2

An Owl appears and he orders it to his shoulder.

Kurt uses dash to chase the Wight

"Undead using traps to guard the secret entrance. I am afraid we are too late. Let's find and destroy them and try to find any clue for Ro Vena and her fate."

(I hope the stairs are not still on fire...for Kurt's sake)

Xellos says, "We might as well clear out this place. It would be rude to not make an appearance at this point."

Kurt: 

You bound up the stairs and enter the next room, which you immediately recognize as a kitchen. There are no other creatures in the room other than the wight that just tried to escape the cellar. You can tell that the wight has very little life and strength remaining; two encounters with the Wall of Fire and one encounter with Aganazzar's Scorcher have taken their fiery toll on the undead monster. Still wielding its longsword, it turns to face you for one last battle. 

15 Damage: 6 | 19 Damage: 6

The wight fails to land any of its sword attacks. 

Frandal will follow the ones that rush after the undead.

Quote from Jack_Joke >>

Kurt: 

You bound up the stairs and enter the next room, which you immediately recognize as a kitchen. There are no other creatures in the room other than the wight that just tried to escape the cellar. You can tell that the wight has very little life and strength remaining; two encounters with the Wall of Fire and one encounter with Aganazzar's Scorcher have taken their fiery toll on the undead monster. Still wielding its longsword, it turns to face you for one last battle. 

11 Damage: 10 | 7 Damage: 8

The wight fails to land any of its sword attacks. 

The initiative order has now been broken up a bit; you were the first one to dash up the stairs.

 Map of the kitchen (ground floor) as everyone reaches the top of the cellar stairs:

 

Attack: 22 Damage: 7Seeing the wight trying to make a last stand, the elf unseathes his sword and tries to cut him with the same movement,rising his sword from the hip to the shoulder, and with a movement of his wrist, cut it again  when the sword descends.