"The door is welded from the outside? Let me take my smithing and mason's tools, I'll break it down in no time." says Krom as he takes out his tools and immediately begins to work on breaking down the door.
"I wonder when it was welded, I doubt that it was always like this before the fall."

"I can pick locks and stuff but I can't break into doors that are welded shut.  Hopefully your tools can get us inside."

Krom, make an Investigation roll.   You can add your proficiency bonus to the roll. 

(@Krom. Kazri used Branding Smite on the previous attack.)

“I am saving my more powerful attacks for larger threats.” Kazri respite Krom. “I would rather take the hits, that is my responsibility after all. Worry not about me Master Krom. I thank you for your concern.” Kazri take the healing offered by Krom.

(21)

"Could be a sign of our thus far unfound drow's work." Rhogar mentions while once again retrieving the armors and swords. "Though-" He paused for a moment to study one of the blades, though he narrowly drops it when Gorrah chose to land abruptly on a shoulder. "-Hmph! A little warning, next time?" The dragonborn chides, only to see from the corner of his eyes the psuedodragon simply turn her snout up in response. "....Anyways, ehm.... yea. Could be the drow. But why and how they'd manage such a feat I dare not even guess. But we should be expect, uhm... Hmn. Not company, but whatever the reverse of that would be." Rhogar said with a snort, before striding on over ready to provide whatever help he could in removing the door. 

"I'm glad to hear that this place is not interfering with your abilities." replies Krom as Kazri's answer to his question. "It could be the drow, yes, but in that case why the Magen didn't attack them? As far as I know, we didn't find any signs of battle around this building."
The dwarf murmurs a chant of divination and aided by Rhogar doubles his efforts to remove the door.

Investigation 11 + 4 from Guidance (Check rolled with advantage due to Rhogar's help)

OOC
@Kazri I missed the post about Branding smite 

Krom gets out his mason tools; a trowel, a hammer, a chisel, brushes, and a square. He also gets out his smith tools which consists of various sized hammers, some tongs, charcoal, rags, and a whetstone. He inspects the door, which is made of iron, and the stone wall that surrounds it. The tools are not enough to dismantle an iron door welded in place.  However, he is able to determine a couple weaker spots. 

If you want to enter the tower you will need to break the door down.  The work of Krom will give you advantage on attacks rolls to beat the door down.  

Kazri takes out her old weapon, Nature’s Grasp, and try to hit on the weak spots shown by Master Krom.

Attack: 27 Damage: Unable to parse dice roll.

"This door is sturdier than I thought." says Krom after examining the door. He nods in appreciation at Kazri's weapon choice as the paladin strikes one of the weak spots with powerful swing. The dwarf immediately follows up with two-handed swing of his blessed warhammer.

Attack: 25 Damage: 15

"Hmn! So it is! I think I'll leave it to you two, and stay aside, as I don't have much aside my strength of arms and... a belaying club. And I rather like not to break either." As Rhogar chuckles, a few sparks fly from his mouth. But otherwise, the dragonborn is true to his words, and stepped at least a few feet away from the door to watch and wait alongside an amused seeming Gorrah. 

"I have nothing to aid in breaking down an iron door.  I will keep watch.  I am concerned about the noise that we make but see no other solution."

Chill turns away from the work on the door and keeps an eye out for trouble.

The door still stands though it is pretty battered at this point.   A couple more hits will probably finish it off. 

Krom continues to bash relentlessly the door with his hammer "Those Netherese knew how to build a sturdy door." says the dwarf between a strike and the other.

Attack: 27 Damage: 11

Attack: 29 Damage: 12  (If the first hit is not enough, I'll hit it again)

Kazri is surprised that the door is still standing. She follows Krom lead with Nature’s Grasp.

Attack1: 29 Damage: 13

Attack2: 16 Damage: 13

(Duh. I forgot we have two attacks now.)

As Krom hits the door it finally breaks free.  As he starts to fall it burst outwards and a large blue monster bursts out of the door and attacks!

Initiative - Chill 12, Kazri 11, Krom 10, Rhogar 3, Monster 3

Rhogar is paying attention, Chill is always alert, Kazri is ready for trouble.  The creature bursts out as Krom is caught flat-footed as the door crashes open.

Everyone is within 5 feet as the creature bursts out the door and into your midst.

Rhogar, Chill, Kazri up in that order

Rhogar (81/87), Chill (73/73)+3, Kazri (68/114), Slaad (), Krom (93/104), 

Gorrah (22/27), Oli (27/42)

Kazri tosses Nature’s Grasp to the side and takes out her Dragonslayer Sword. (Is that an action?)

(Traveling today. Will try to post later.)

(@DM. Did you add the 14hp that Kazri got from Krom earlier?)

Feelings of panic is broadcast to the rest of the party as Gorrah dived off Rhogar's shoulders and ascended just outside the tower to avoid being mistaken as a bite sized treat! Rhogar, on the other hand, had neither the luxury or the gall to do same.  Not without giving the rest of the crew a similar choice. So, just as soon as the initial shock left his system, the Bronzeborn exhaled a cloud of mist into the creatures face, before potentially hopping back and saying, "With all due respect to the rest of you, I think I'll let you have the first dance with this one." He says while giving a cheek wink to the party. 

Action(Gorrah): Disengage.

Movement(Gorrah): Fly up to 35ft besides the tower.

Action(Rhogar): Unleash Ennervation Breath on creature. Con Save(DC 15) or become incapacitated until the start of Rhogar's next turn.

Movement(Rhogar): If above Con Save is failed, then Rhogar will back away 25 feet. 

“Stay back Oli! We will handle this one.” Shouts Kazri as the blue monstrosity gets too close to everyone for the Paladin’s comfort. She moves to the front of the monster, brings the Dragonslayer Sword high, and with a quick prayer, it lights up a radiant light. (BA Divine Smite 3lvl 16) (Oli takes the disengage action)

Attack1: 21 Damage: 13

Attack2: 20 Damage: 14

(Attack rolls got messed up. Rerolling here.)

Attack1: 11 Damage: 18

Attack2: 23 Damage: 14