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Cloak 1 moves to attack Heilamin. Cloak 2 stands atop their fallen comrades and attacks Brazzak. Cloaks 3 and 4 both move and attack Renee. 

Cloak 1 Attack: 10 Damage: 7
Cloak 1 Attack: 21 Damage: 8

Cloak 2 Attack: 21 Damage: 7
Cloak 2 Attack: 5 Damage: 6

Cloak 3 Attack: 17 Damage: 4
Cloak 3 Attack: 16 Damage: 4

Cloak 4 Attack: 21 Damage: 6
Cloak 4 Attack: 24 Damage: 10

Round 3 Initiative Order:
Heilamin
Mackenzie
Renee
Cloak 5/6 
Cloak 7/8 
Brazzak
Cloak 3/4 
Cloak 1/2 

Heilamin and Mackenzie, you're move!

Heilamin will cast a second 3rd level Thunderwave to get the most cultists (2, 7, 8, and 6?). As a bonus action, he will cast Healing Word on himself (7).

Likewise, the next time a cultist goes to attack Heilamin, he will use Bardic Inspiration as a Reaction, and call out insults against that cultist remarking on his general lack of good looks and pro-social behavior -- thereby subtracting 8 from that attack roll.

The attacks against the paladin do not penetrate his magical barrier and with the party fully engaged by the cultists, Mackenzie just attacks, targetting cultist 2 (in a effort to reduce the risk to Heilamin) and then the next closest to Heilamin (cultist 5) even if it provokes an opportunity attack from cultist 8 as he moves to the square to the right of him.

Attack: 9 Damage: 10

Attack: 11 Damage: 12

Bonus Action: Attack: 21 Damage: 5  (damage 8 if he can use Great Weapon Master for bonus action - can't believe that rolled lower)

Meanwhile, elsewhere in the monastery:

Cloaks CON save against DC 15. On fail take 15 and pushed back 10 feet. 

Cloak 2: 10
Cloak 6: 9
Cloak 7/8: 10

Cloaks 2 and 6 die to the blast of thunder damage. Cloak 7 and 8 take 9 damage and are not pushed back. 

Mackenzie you move 5 ft to attack Cultist 5 but take the AoO from Cultist 8. 

Attack: 6 Damage: 8 

They miss as you move and hit twice with your weapon. You kill cloak 5.

Renee attacks cloak 7. 

Attack: 15 Damage: 12 sneak attack: 8

Renee strikes down Cloak 7. She is still visibly shaken by these strikes she is doing. 

Cloak 8 strikes to retaliate against Renee. 

Attack: 12 Damage: 3
Attack: 22 Damage: 7

Brazzak, your move!

Stepping over the fallen cultists, Brazzak swings his massive sword.

Cultist 8 falls to Brazzak's blade. Cultist 4 is heavily wounded. 

The remaining cultists fight to their last breath! Cultist 4 attacks Brazzak, Cultist 3 attacks Renee. Cultist 1 remains and attacks Heilamin. 

Cloak 1: Attack: 14 Damage: 5
Cloak 1: Attack: 18 Damage: 5

Cloak 3: Attack: 10 Damage: 3
Cloak 3: Attack: 23 Damage: 8

Cloak 4: Attack: 12 Damage: 4
Cloak 4: Attack: 16 Damage: 7

Heilamin/Mackenzie, your move.

Mackenzie steps over the fallen cultists to swing at the nearest one threatening Renee (Cutlist 4) then targets the other one (Cultist 3)

Attack: 22 Damage: 13

Attack: 22 Damage: 7

Bonus Action (GWM) Attack: 24 Damage: 5  (assuming that he kills one of the remaining otherwise damage is 6 from Polearm Master)

Heilamin's Cutting Words reaction decreased the first attack from Cultist one such that it missed, the second one hits. Heilamin will cast Dissonant Whispers at 3rd Level on Cultist 1. (The target must make a Wisdom saving throw. On a failed save (DC 15), it takes 5d6 (14) psychic damage and must immediately use its reaction, if available, to move as far as its speed allows away from you. The creature doesn’t move into obviously dangerous ground, such as a fire or a pit. On a successful save, the target takes half as much damage and doesn’t have to move away.)

As a Bonus Action he will cast Healing Word (1st Level) (1d4+4) -- anyone need this (Heilamin is at half hit points)? Otherwise he will cast it on himself. (Heal: 5)

Cultist 1 WIS save vs DC 15: 9

The cultist takes 14 damage, heavily wounded, and moves 30 feet south, towards the ladder down to the "boat dock". 

Cultist 4 falls to Heilamin's blade, and Cultist 3 is heavily wounded. 

Renee takes her attack on Cultist 3. 

Attack: 18 Damage: 11

Renee strikes down Cultist 3...the only cultist to remain is Cultist 1 with 4 HP left. Brazzak, finish them off!

Ikko, from inside of the temple you were awaken from your vision by the sounds of a battle happening in the temple grounds. You are getting ready to round the corner to the temple entrance. The woman monk who you have briefly met is standing in the doorway. Ikko will round the corner after Brazzak's action. 

Once Ikko rounds the counter and is met by four adventurers, covered in blood (both of theirs and these cloaked figures). A monk, who first greeted you when you arrived at the monestary, is face down on the ground in a pool of blood. The bodies of 10 cultists, and a blasted body of some sort of humanoid creature all lay on the ground, slashed and bloodied.  Everyone's weapons are drawn after the battle with these cultists. 

Brazzak attempts to strike down the last cultist.