Orubis dodges and swings his spiritual weapon at M2

Attack: 14 Damage: 4 

Rodolfo really doesn't like a petrified drow in his face, but can't do much about it either, so he will also take the Dodge action.

Orubis ducks behind his shield as his spiritual weapon fails to do any lasting harm to the petrified drow. (dodging)

Rodolfo stares at the petrified drow next to him and tries to anticipate the attack, fully on the defensive. (dodging)

The petrified drow (@L5) attacks Beegred twice.

The petrified drow (@K3) attacks Orubis (disadvantage) twice.

The petrified drow (@M2) takes a step (to @L1) and attacks Orubis (disadvantage) twice.

The petrified drow (@M5) moves (to @M2) and attacks Orubis (disadvantage) twice.

(Thurnir gets an AoO vs. @L1)

Attacks vs. Beegred:

• Attack: 17 Damage: 7
• Attack: 19 Damage: 8

Attacks (disadvantage) vs. Orubis:

• Attack: 9 Damage: 7
• Attack: 11 Damage: 3
• Attack: 5 Damage: 6
• Attack: 19 Damage: 3
• Attack: 8 Damage: 6
• Attack: 19 Damage: 8

(Beegred's turn)

Thurnir uses his aoO on L1

25 to hit

12 damage

Thurnir succeeds in hitting the petrified drow as it casually moves away.

(Beegred, then Skameros, Thurnir, Rodolfo and Orubis, in that order)

Skameros continues to swing with reckless abandon, this time at L5

[Greataxe: 21 Damage: 8 slashing damage]

[Greataxe: 26 Damage: 18 slashing damage]

And if one of those hits his divine fury will proc for 8 radiant damage.

Skameros winds up several blows meant for the petrified drow, bumping into Thurnir and Rodolfo, even banging them with the haft and head of the greataxe, to their dismay.  However, the reckless abandon has obvious results as the petrified drow (@L5) shatters into shards, with another petrified drow (@K3) following suit.

(I took the liberty of applying the second attack's damage to the most damaged enemy, since Skameros didn't specify an alternate target).

The dusty cloud humanoid shapes of Ogremoch's Bane briefly remain behind as the bodies they occupied crumbled to pieces.  Then as if a breeze swept them away, they drift towards the north-west to join the roiling mass barely visible along the cavern wall in that direction.

(There are two left, @L1 & @M2.  It is Thurnir, Rodolfo and Orubis's turns, in that order)

Thurnir attacks M2

25 to hit 1

14 damage 1

plus hunters mark 4 

19 to hit 2

9 damage 2

plus hunters mark 1 

Well first hit is. Crit-  9 more damage plus 3 hunters mark damage if that doubles.  Can’t remember the rule.

“Mayhap ye should tryn banish it wit yer magic when we break these last statues?” Thurnir asks,  grunting a bit about getting jostled around in combat. 

All dice, roll twice on crits

only thing that doesn't double is the bonus damage.

Not to be shown up by Skameros, Thurnir gets serious and demolishes one (@M2) as well.

(Rodolfo's up.  Then Orubis)

Rodolfo thinks of a plan:

Rodolfo says, "This might be our chance! Hold it down, grapple it, but don't kill it yet. I need to get ready!"

I faints to the right and then runs left instead (action: disengage) and moves to K6. He turns his attention fully on the swirling cloud and spits in his hands, starting to chant an unfamiliar spell.

But then realizes that it's too convoluted - it's better to just go for it right here and now!

He casts banishment on the last statue.

Ogremoch's Bane DC 15 saving throw vs. Banishment: 24

Edit:  Well, learn something new.  I didn't add or modify the roll, but I did change the DC from 13 to 15 (looked at Beegred instead of Rodolfo, oops).  It seems that changing any NUMBER that occurs before a roll causes the 'manipulated' warning, not just numbers in the actual equation for the roll.

In case that causes the roll result to change for others, the original result was 20, ie: 16 + 4.

Rodolfo casts the 'Hail Mary' spell he had learned and prepared for this battle with Ogremoch's Bane.  When the spell is released, Ogremoch's Bane reacts violently, a tsunami of malevolence smashing against all of your 6th senses, almost overwhelming each of you.  It did not like what almost happened, as it succeeds in resisting.

The mass of dust that was partially in the north-west wall surges back into the chamber... 

(Orubis's turn)

Rodolfo shies back at this, "Oops!"

Orubis follows up with the same banishment

DC 14 Cha save

Ogremoch's Bane DC 14 saving throw vs. Banishment: 24

With all of the malevolence of Ogremoch's Bane being focused towards Rodolfo, Orubis reaches out to touch the remaining petrified drow and also casts Banishment.

The malevolence barely has time to shift directions towards Orubis before all of the dusty cloud form gets siphoned into small sphere.  An occasional pseudopod can be seen trying to break free from the perfect sphere as Ogremoch's Bane fights to escape the magic of the spell.  

Then the sphere vanishes and an ear popping thunderous boom sounds out as the air rushes in to fill the vacuum where the sphere was a moment ago.

As your ears ring, the room feels eerily silent as nothing moves.  

If it wasn't for the mental echoes from the sea of oozes screaming "FLESH FOR THE FACELESS GOD!" from some distance away, it would be completely and totally serene.