As one of the guards prostrates himself on the floor, Zolya's guiding bolt smashes into the fiend positioned near the door. The two guards who can actually respond to the sudden barrage of attacks do their best to regain control over their charges.

The fiend by the door returns fire at Zolya, sending a sphere of flame across the room at him...

• Hurl Flame attack @ Zolya: 15 to hit, causing 6 fire damage

The fiend near Geoffrey, swings twice, attempting to smash his foe with hell-forged knuckles...

• Melee attack 1 @ Geoffrey: 15 to hit, causing 9 bludgeoning damage
• Melee attack 2 @ Geoffrey: 14 to hit, causing 8 bludgeoning damage

Round 1 has ended. Each of you may take an action in any order. Keep in mind that guard 3 is currently prone. See map below.

(Also, the next attack against fiend 1 will  have advantage)

Zolya stumbles back as the flame hits him in the shoulder, burning through his robes. He snarls, and waves his hand in a quick slash. Holy flames erupt in a pillar under Fiend Guard 2's feet as he casts sacred flame. The Fiend Guard must make a DC 15 Dex Save or take 10 Radiant damage.

"Feel the wrath of the Holy One, Foul Being!" He shouts as he casts healing word on himself for 5 HP of healing.

After swinging twice at Geoffrey, the fiend (#2) attempts to evade the radiant flames that appear around him. (DEX save - 6)

Round 2 continues. Boisseau, Geoffrey, and Kagenthur may act, in any order. 

Geoffrey strikes out with his rapier and dagger at #2

Action - Attack: 11 Damage: 7

BA - Attack: 10 Damage: 1

Kagenthur will follow Geoffrey's assault with a hail of hammer blows. 

Action: (2 attacks)

Hit: 23

Hit: 24

Bonus Action: (1 attack) 

Hit: 26

Boisseau will continue to throw both hands forward and casting Eldritch Blast directed towards the one who is hurt the most:

Attack 1: 17 Damage: 1

Attack 2: 26 Damage: 5

Kagenthur's flurry of attacks quickly removes another fiend from the battle, as the second guard falls lifeless to the floor. Boisseau then successfully directs his eldritch blast toward the guard who remains steadfast in front of the door. 

The look of desperation on the faces of the two remaining fiends is evident. Both hope to turn the battle in their favor. The guard at the door hurls another ball of flame, this time at Boisseau...

• Hurl Flame attack: 8 to hit, causing 11 fire damage

The fiend that has been groveling on the floor stands and steps toward Zolya, swinging his fists twice...

• Melee attack 1: 12 to hit, causing 8 bludgeoning damage
• Melee attack 2: 9 to hit, causing 6 bludgeoning damage

Round 2 has ended. Only two fiends remain: #1 and #3. All players may act, in any order. 

Kagenthur rallies from the successful barrage and runs to the fiend in the far corner (1). He attempts several more blows upon the foul creature while shouting,

"AHAHAHA!! THE DRUMS IN THE DEEP!" 

1 Hit: 8 

Damage: 9 

2 Hit: 12 

Damage:  12 

3 Hit: 25 

Damage:  10 

Kagenthur's hammer continues to torment the fiends; with three strikes in succession, he drops the guard at the door.

Only fiend 3 remains. Zolya, Boisseau, and Geoffrey may act in any order. 

Boisseau will turn and direct both hands towards the final remaining guard. "Pardon Monsieur, but your service will no longer be required." He shoots another set of Eldritch Blast

Attack 1: 24 Damage: 3

Attack 2: 12 Damage: 7

Geoffrey will fire a shot off with his crossbow

Attack: 21 Damage: 8

if it hits, another 6 psychic damage

Crackling energy fills the room momentarily as Boisseau sends two arcane blasts toward the last remaining fiend. One of the blasts is on target, but the fiend eludes the second. As he does so, the sharp twang of Geoffrey's crossbow is heard. The fiend snarls loudly as the bolt sinks into his shoulder.

Zolya may act. The last fiend is roughly 10' distant and moderately wounded. 

OOC: I shall slay thee!

Zolya plays a note on his lyre, and the crossbow bolt which just sink into the Fiend Guard's shoulder is set ablaze with divine fire as Zolya casts sacred flame. The Fiend Guard must Make a DC 15 Dex Save or take 8 radiant damage. 

OOC: hopefully I don't roll horribly for damage.

DEX save for wounded fiend: 8

The last of the guards takes the full damage from Zolya's cantrip, and you sense that he would rather die in this fight than face the consequences of fleeing. So, with his remaining willpower, the fiend steps forward and swings once at Boisseau, cursing in Infernal as he does so...

• Melee attack: 14 to hit, causing 8 bludgeoning damage

He then hurls another ball of flame at Zolya...

• Hurl flame attack: 23 to hit, causing 3 fire damage

The next round of combat has begun. The lone fiend is severely wounded. Each player may act in any order. 

Boisseau draws a dagger now that the fiend is up close and stabs at it after turning to throw its flame.

Attack: 11 Damage: 3

Damage rolls are liking nat 1's!

Boisseau's blade glances harmlessly off the fiend's leather skin. 

Kagenthur, Geoffrey, and Zolya may act, in any order. 

Pulling his hammers from the fiend in the corner, Kagenthur turns slowly with absolute mirth and flies at the final demon like a rapid dog

A1 16 

H1 6 

A2 15 

H2 8 

A3 16 

H3 5