Silas shrugs before trying to follow, "Proably best to have those least likely to success at this go first,"

Stealth: 4 +  2 gudiance (Not one is suspised really)

Badger Stealth: 16

The group sneaks along the balcony.  Silas accidentally drags his armored foot on the ground with a loud grating noise. Everyone freezes and looks down at the creatures. They continue on their way as if they didn't hear. You sneak over and reach the wide hallway.  There is a heavy stone door blocking the exit to this room. 

Mal will creep up to the door and check to see if it is locked or trapped.

Investigation: 14

Mal checks the door....and...  its just a big slap of stone.  No hinges.  No crack in the middle. Best as she can tell, it should slide upwards, but there is no mechanism apparent to make it do so. 

She signals the rest of the group to gather close and once the rest of the party is closer whispers, "Door should slide up but mechanism is not on this side or at least not near this door. I will go back to the end of the hallway and look about the room again to see if I see something that will help."

Stealth: 21

Perception: 18

There isn't much of a hallway, maybe 10 feet worth before the sliding door. Mal looks around.  She notices something strange. To either side of the door, on the walls on each side, there appears to be a secret door. Though pressing on them, they seem to be securely locked, and there's no keyhole to speak of. 

By the Nine curse this place, Mal screams in her head, I can not wait to be done with his godforsaken place. Whispering back to the group, "there seems to be two secret doors next to this passage but again I see no way to open them from this side. Any of you magic wielders able to get through the doors.....Wait, sickle are you able to reshape the stone with that spell you uses earlier and make us a door through it?

Badger rubs his nose and says: Why yes, in fact I've cast such a spell before, if you remember... or perhaps you don't. Anyway, let's take a look.

With just a little extra theatrics, Badger casts Knock on the left-side secret door.

From the secret door issues a very loud and clear 'BANG' that seems to echo through the underground dungeon. Then, the stone secret door swings open. 

An unholy stench pours from the room, followed by three undead creatures smeared with rotted dried blood, with elongated wicked fingers and limbs, their bluish flesh giving off a foul odor. 

(Roll init) 

Undead: 8

If you go before them, state your turn. 

Sickle Init: 11

Sickle was reaching up with his staff to draw a seam on the door that would spilt it when Badger volunteered.  As the door swung open violently and the stench hit his nostrils, his eyes flared wide at the fearsome sight before him.  Instinctively he cast a Lightning Bolt at the creatures as they came pouting through the door.

DEX Save DC 16 or 27 damage, half on success.

1: 6 2: 17 3: 14

The blast rips through all three.  Two of them look particularly fried, their undead flesh smoking badly, while one looks not too bad off.  All are still up. 

Mal Initiative: 24

As badger moves forward to cast his spell, Mal will move back a bit pulling out her crossbow just in case. Then seeing the creatures burst forth she will take aim and start firing.

Crossbow #1: Attack: 25 Damage: 5

Crossbow #2: Attack: 29 Damage: 10

Initiative: 6

Grenk initiative 18

Sword in hand Grenk rushed forward as he drew his shield and evoked his blood magic two cause the sword to burst forth with radiant light and then aearing fire.  He struck down at the first and would continue to the second if able.

Bonus action activate rite of dawn dealing 1 to self

Attack: 15 Damage: 11 + 5 fire and 7 radiant

Attack: 26 Damage: 4 + 8 fire and 3 radiant

Mal steps back, two loud thwangs from her crossbow.  The lead undead collapses with two bolts through it. Grenk steps up, the next one in line being less injured from the lightning.  It ducks Grenk's first swing, a trail of flame arcing through everyone's vision, but Grenk brings his blade around and slams into the creature, leaving a burnt gash through it's chest.  The creature continues to advance....

Badger? 

(Sorry for holding things up)

Badger Initiative: 5

Badger is still self-admiring his magical talent at opening the door, and doesn't notice the attackers in time...

With Grenk leaping into action, he's faced with both undead as they try to claw him to death.

Attack: 8 Damage: 6

Attack: 15 Damage: 8

Both of them claw at him to no effect. 

Everyone may go.  Grenk, DC 10 CON save at the start of your turn or be Poisoned. 

Con save 6

Grenk laughs as the claws make zero contact but then starts coughing.  He swings a little more wildly at the one trying to end at least one before focusing on the other.

Attack: 15 Damage: 9 + 7 fire + 8 radiant

Attack: 16 Damage: 11 + 9 fire + 2 radiant

Not terrible with disadvantage 

Mal will aim and fir at the creature that Grenk is in melee with.

Crossbow: Attack: 29 Damage: 8

Crossbow: Attack: 23 Damage: 9

Sneak Attack Damage 1st hit: 6