Sieghart believed that the ghouls were merely a distraction to allow Orbid to escape once again. They needed to get through those double doors quickly.

"We need to get through these doors!"

Sieghart ran and tried to pull the door open.

(Should I roll anything?)

No, it doesn't budge no matter how hard you pull. As you yank on them you are able to hear a large wooden beam barring the other side.

Lucas, your turn!

Lucas moves over to the gate, pulls a little flask of holy water out of his pouch and throws it on Arlo.

(casts `Protection from Good & Evil` on Arlo -- Ghouls have disadvantage on attack rolls against Arlo)

"Arlo, here's a blessing to protect you against those ghouls."

Afterwards he pulls out his battleaxe, ready to fight alongside.

Edit: Funny how we both posted something at the same time lol

The Ghouls become more ravenous as the bars slowly raise. Spittle flings from their jagged, disease ridden toothed mouths as they howl in hunger.

With the closing of the first round the bars make up about 3ft. It is now possible for anyone to duck under and access both rooms.

Happy, your turn! 

Is it now possible to hit them with a spell? Maybe with disadvantage or Cover for them?

You can definitely hit them. As far as how the bars look think prison style. Just enough to get an arm through.

Ok then Happy will cast Eldritch Blast at the one he just Hexed. 

Attack: 10
Damage: 7

Hex Damage: 1

Edit: He also will move so he has better line of sight. About 5ft. back and 15 to the right. 

The crackling beam of energy streaks between Arlo and the door, and then on through the bars hitting your target. The jolt of energy makes the ghoul stumble backwards before it regains its composure to jump at the bars. You can see a large blackened patch of flesh where your spell landed letting you believe that it was a strong hit.

Arlo, your turn! You are able to take a swing at one of them if you'd like.

Arlo lets his axes swing.

Attack: 20 Damage: 4

Attack: 18 Damage: 6

You bury both axes into the ghoul's chest. As your axes sit there you feel the creature fight the pain at first, but quickly goes limp and falls backwards, dead. The second ghoul gives out a discordant scream of anger.

Sieghart, your turn!

Sieghart is angered by the door being barred. Seeing that the door is handled by Arlo and Happy. He decides to look for another way into the laboratory. The only other passage being the room where the green light emits from, Sieghart begins making his way there, bow at the ready.

(Head 30 feet to the north room.)

This is what you see, Sieghart.

 Is there anything else you'd like to do?

 @Dungeon_Maxter

Sieghart:

 That's about all you can do in a turn. Lucas, your turn!

(Edit: my bad, I cometely forgot to call the turn change.)

Lucas swings his axe at the other Ghoul. 

attack: 18
damage: 8

Unfortunately there isn't enough room for you to swing unless Arlo were to have stepped out of the way on his turn. Firing projectiles is one thing, swinging an axe is another.

Something else you can do is get next to Arlo and ready your attack. If the ghoul starts to crawl under the portcullis, then you can use your reaction to make your attack since they would be adjacent to you. As of now you'd have to be in Arlo's spot to take a swing since the opening is recessed.

Or if there's something else you'd like to do, you can do that.

(doh my bad, I didn't look at the map closely enough. This makes sense)

Lucas looks up at the gem embedded in the ceiling and jumps up and swings his axe in an attempt to break it. 

Athletics: 14

Axe Damage: 3

(Let me know if there's a more appropriate move for this action)

(It's ok. I can roll with this)

With a leap and a swing of your axe, you manage to connect with what little of the gem is protruding from the ceiling. As you land and look back up at your efforts you see that it did not break, but it does appear to be loosened due to the noticable gap on one iside of it. You think another hit will knock it out.

With the portcullis opened enough the remaining ghoul scurries under and attempts to lash out at Arlo with a claw.

Attack: 9

Slashing damage: 9

 Happy, you're turn!

Happy sends another Eldritch Blast at the already wounded Ghoul. 
Attack: 9

Damage: 4

(The ghoul you hexed and the only one that took damage was killed by Arlo. Did you want to transfer the hex? If you're transferring hex, then go ahead and roll that extra damage and say what ability he has disadvantage with. And no need to roll the attack again, we can just transfer it.

You're also going to have to shift over some to get line of sight on the ghoul. If needed I can update the map, but as of now the ghoul is right in front of Arlo (up one square from last round), Sieghart disappeared, and Lucas is close to the center of the room (the square left of you and up from Cathrine).)