Oh and M’orron runs in after bladesong has begun

Perception: 21

M'orron enters a graceful movement as the blade whistles through the air. The blade swings into the fog and seems to make contact with something, barely, striking at the silhouette of the figure and wreathing it in sonic energy. (Mist: 3 damage.)

The Mist seems to react to M'orron's strike as the 'arms' of the figure seem to thicken and coat around M'orron.
Enveloping Mists: M'orron must make a DC 15 Constitution saving throw, taking 17 poison damage and become poisonedon a failure or half as much damage and no additional effects on a success.

Aurhook, Salleek, and Kysdove, your turns! M'orron, you can prep your next turn too, since there's no creatures between you and your next turn, but it will be resolved after the other three.

INITIATIVE: ROUND 1

Con saving throw 11

M'orron looks heavily hurt by the poison

(Just to note, you can save at the end of each of your turns agains the poisoned condition.)

Aurhook flies up 20 feet and looses a volley of arrows at the mist-like figure.

Attack: 3 Damage: 9

Damn

Kysdove winces at the hit to M'orron and raises a hand to cast Eldritch Blast at the mist creature.

Attack: 24 Force Damage: 13

A beam of crackling energy lances out from her hand, coloured a little bit like the red/orange of dawn light. It is there and gone in an instance.

Following that, she'll look toward M'orron and use Healing Light (bonus action) to heal him 6 HP.

Aurhook flies up and looses an arrow. However, as he gets up higher, he realises he cannot see the party anymore! (Remember, your visibility is restricted to 15 feet in this fog.)

Kysdove's blast hurls at the figure enwreathing M'orron and it seems to distort, causing its arms to release her companion. A glimmer of light shines upon M'orron, soothing the body after the poison entered his body. The form of the mist seems to almost solidify for a mere second. (Mist: 16 damage. M'orron: 14/20 HP)

INITIATIVE: ROUND 1

Aurhook lowers himself by about 6 feet

(Just for clarification, we are fighting the fog/mist that is around us?)

(The environment is foggy. There is an entity within the fog that appears to be gaseous in nature, which is what the group has been attacking.)

Salleek draws his longsword and shield

Movement: Salleek moves towards the gas creature. (unless i am already within melee range)

Attack: 13 (attack with longsword/slashing)

Damage: (if it hits) 11 (piercing damage)

Bonus Action: Salleek casts Sanctuary at level 1 on M'orron

(@DM is the lighting considered dim?)

M'orron mumbles to himself "An attack that I cannot dodge... need to change tactics"

M'orron pivots around the target to make sure he does not injure his companions, then stretches his arm and claps them together to cast Thunderwave (2nd level) (Con save DC 14)

Damage 18 Thunder

After that he backs away about 20 ft (if I get an opportunity attack against me AC is 22 and if it would hit me I use my reaction to cast shield)

(Yes, the area is counted as dimly lit)

Salleek heads forward, a Sanctuary placed upon M'orron to protect from blows. Then a strike with the rapier strikes into the gaseous mist creature, though it doesn't seem too effective. (Mist: 21 damage.)

M'orron then decides to brings his magic to hand as a huge thunderclap booms through the streets, striking at the mist.
Mist's Constitution Saving Throw: 16
The mist appears to nearly dissipate, but reforms once the sonic blast ends. (Mist: 30 damage.)
With the sanctuary broken, M'orron flees back. The mist does not seem to attack him as he backs away.
(M'orron may repeat the Constitution saving throw to no longer be poisoned)

The Mist, now beside Salleek, seems to spread thin and almost disappear within the background fog. There is an eerie chill about Salleek.
Chilly Mist: Salleek must make a DC 13 Constitution saving throw, taking 1 cold damage and their speed reduced by 10 feet for 1 round on a failure.

The mist now is nigh-impossible to make out due to the dense fog in the area.

INITIATIVE: ROUND 1

Con save 22

(Forgot the damage for Hex when I hit the mist thing earlier).

1 necrotic damage

Aurhook no longer seeing the mist from the sky lands near Kysdove and M'orron then uses Two-weapon fighting with his rapier and dagger to deal slashing damage

Attack Rapier: 2 Damage: 11

Attack Dagger: 1 Damage: 7

(for dm; Salleek is using a longsword, you put rapier)

Constitution: 9

Movement: no movement this turn

Action: Perception: 17 (i'm trying to look for the gas creature)

Bonus Action: Salleek: (to the party) "Does anyone see where it went?"