Order - Oli, Chill, Krom, Rhogar, Kazri, Duergar, Zombie Ogre

Chill is at the bottom of the well

Chill whispers to Gorrah.  "Let's climb up here and see what's going on.   I think this is a well and that must lead into buildings behind the gate.  Hopefully the others are doing well. You can alert Rhogar and let him know what's up from our end."

He'll then carefully climb up well.  When he reaches the top he'll peek over the edge and look around.

Stealth 33

Perception 31

As the group approaches the stronghold, Krom notices at the last moment the crossbow bolt flying at him, the dwarf interposes his shield to avoid a direct hit, but the bolt manages to draw some blood.
"It looks like the stronghold is not empty after all." he says as the group forcefully open the main door and the duergar unleashes the zombie ogre on them.

Krom, holding in front of him his shield bearing the holy symbol of Moradin, chants an hymn to the All-Father "Begone foul creature! Begone!", the shield flashes with radiant light.
Immediately after, the dwarf chants a hymn of evocation conjuring a flaming maul next to the duergar. An invisible giant hand swings the maul down attempting to crush Krom's foe.

Movement: 25ft towards the ogre in order to be within 30ft from him
Action: Turn Undead Wis 15 -  (Destroy undead if the creature CR 1 or lower)
Bonus action: Spiritual weapon at 2nd level on the duergar  Attack: 22 Damage: 9

"So it seems, Master Krom. So it seems! I'll see if I can deal with our Bunker friend on the off chance we need to retreat." Rhogar said, though his words quickly become hard to hear over the sound of crackling electricity emanating from his mouth as he turned about towards the Bunker. His next words are less true words in the common sense, yet held a power of their own in condensing the wild mass of energy into ultimately focused beam right for the bunker... and anyone too close to the arrow slits to avoid stray fire.

Afterwards Rhogar is left coughing a bit, but still held a smile as he plucked stray motes of energy from the air and converted it with but a thought into more positive bubbles that he'd send Krom's way to mend the dwarf's wounds.

Movement: 10ft northwest, then 15 west (trying to line up the below action with western-ish arrowslits of the bunker)

Action: Unleash (3rd level)Storm Lord's Breath into the Bunker. Any Creature caught within the 100ft line needs to make a Dex Save(DC 16) to take half of 28 of Lightning Damage. (Since it's a dex save, they will have a cover bonus add to their save at DM's discretion)

Bonus Action: Healing Light(2) to Krom, restoring 9 HP.

With a prayer to Helm, Kazri's Dragonslayer Sword glows bright radiant light. "I shall finish this abomination." She makes sure she clears Rhogar's Storm Lord's Breath, and runs to strike the Zombie Ogre. (Divine Smite lvl3 spell slot (4d8) + 1d8 vs undead)

Attack1: 30 Damage: 14.

Attack2: 24 Damage: 7.

(If any attack hits plus 24 radiant damage)

(In case the crit also rolls the Divine Smite again. +15)

Turn Undead Wis 15 - 13

Dex Save(DC 16)  - 7

Chill remains undetected as he peeks over the top of the well and sees what is happening.

Krom moves up and presents his holy symbol and the zombie ogre bellows as the flames of the holy symbol turn him away from you. A flaming hammer then materializes next to the Duergar and slams into it.

Rhogar positions himself before sending a line of lightning into the bunker through one of the arrow slits.

Kazri rushes forward and deals devastating blows to the ogre who remains standing and bellows at her.

The duergar suddenly disappears from sight.

The zombie ogre moves away from Krom and draws an attack of opportunity from Kazri

Order - Oli, Chill, Krom, Rhogar, Kazri, Duergar, Zombie Ogre

Back to the top of the order.

(Kazri had Oli to watch our back, and stay close to Uncle Rhogar.)

Kazri takes a swipe at the running Zombie Ogre.

Attack: 19 Damage: 9

Seeing that the others seemed to have things well in hand Chill climbs out of the well and moves to the easy down the corridor to cut off anyone else that might come along.

Movement out of well and 35 feet east with crossbow at the ready to fire at any duegar he sees

Attack: 29 Damage: 7.

"Duergar and their invisibility!" mutters under his breath Krom as the duergar vanishes from sight. The dwarf moves towards Kazri positioning himself in a way to guard the paladin's back while preparing himself to swing his hammer at the duergar if he appears again within range.
The spiritual maul floats 20ft estward and makes a wide sweeping attack hoping to catch the invisible duergar.

Movement: 10ft north-west towards Kazri
Action: Ready War hammer attack on the duergar if he appears within range: Attack: 25 Damage: 8 + 8 of fire damage
Spiritual weapon moves 20ft est and make an attack Attack: 19 Damage: 10

(OOC: Gonna presume either Rhogar was too distracted, or the Duergar did his invisibility trick out of direct line of sight, so with that in mind.)

"Keep eyes on Gorrah, then. She'll hunt him down. With a bit of assistance, of course." Rhogar called out assurance. Both he and Gorrah then make mirror gesture of holding out a hand/claws above their heads, before before pressing it to their chest with a softly uttered word croaked in draconic. And thus empowered, Gorrah takes off from Chill's shoulder to fly near where the duergar had last been seen before straining her senses to get a trace of the duergar to follow.... and without hesitance she'd pursue the trail.

Action(Rhogar): Cast Guidance on Gorrah, through Gorrah.

Movement(Rhogar): 10ft into the Doorway.

Movement(Gorrah): Fly to original position Duergar was seen at.

Action(Gorrah): Search with 24.

Movement(Gorrah-Remaining): Towards general position if above perception is successful in narrowing down duergar new position.
(OOC: As a note, she does have blindsight out to 10ft if it comes into play)

(OOC: As a note/reminder, casting the spell through the familiar takes up their reaction, which is why she still had her action.)

Last round -

Kazri takes a swing at the retreating ogre and cuts it.

Additionally, because Kazri struck out at the turned zombie ogre and injured it, the pain of the blow breaks the spell and it is no longer turned.  It whips around and attacks Kazri with a large morningstar

 Attack: 20 Damage: 12

 Attack: 23 Damage: 13

This round - 

Chill moves east down the corridor.  Ahead he sees an open door that leads into what looks like a large open room.

Rhogar is out of sight from where the duergar went invisible but Gorrah is quick to let him know what is happening inside.  Krom's shout also confirms this.  Gorrah jumps from Chill and begins to sweep around looking for the elusive duergar. 

Gorrah is on her game though and notices something the others have not and spots the duergar in the north corner by the left most cage.

Unfortunately for Krom he has moved himself, and his flaming hammer, out of position and the invisible duergar is out of reach. ((He could change his action and redirect to the ogre as the ogre no longer being turned would have happened prior to Krom's turn))

Order - Oli, Chill, Krom, Rhogar, Kazri, Duergar, Zombie Ogre

Kazri is Up, Krom can change his action due to the Ogre no longer being turned but he wouldn't know about the location of the invisible duergar as that is found out on Rhogar's turn.

(With the Blessing of the Morninglord +10hp, and Heavy Armor Master -3 damage, Kazri is back at her regular HP.)

Kazri will keep engaging the Zombie Ogre. She offers another quick prayer to Helm and strikes the Abomination again. (Divine Smite lvl2 spell slot (3d8) + 1d8 vs Undead)

Attack1: 26 Damage: 12

Attack1: 23 Damage: 12

(If any attack hits, it deals additional 16 radiant damage)

(@DM in that case, Krom attacks the Ogre with his flaming hammer. The action for the spiritual weapon remains the same.)

Krom swings the blazing hammer at the ogre and deals a strong blow and a moment later Kazri follows up and brings the ogre down!

The duergar, seeing that her position is made know, attacks Gorrah with a spear 

Attack: 21 Damage: 4

Order - Oli, Chill, Krom, Rhogar, Kazri, Duergar

Chill is up again

Chill continues into the large room, senses on high alert and ready for anything.  He switches his crossbow out for his rapier and is ready to attack any enemy he finds.

Attack: 27 Damage: 7.

"There!" bellows Krom as the duergar betrays his location by attacking Gorrah. Placing the shield in front of himself, the dwarf charges the duergar, swinging his flaming war hammer in an uppercut motion aimed at the duergar's chin.
The spectral maul also flies towards the duergar as if thrown by an invisible hand.

Movement: 25ft NE towards the duergar
Action:
War hammer Attack: 22 Damage: 13 + 6 of Fire damage
Bonus action:
Spiritual weapon: Attack: 16 Damage: 9