Wis save: 4

Is anyone within 5 ft of the creature?

No, the mouther has to end its turn next to it so it can get knocked away on a failed save. Look at the spell Dust Devil.

Merzin is overcome with fear and loathing. 5 Terrified, he runs face-first into the far wall.

The gibbering mouther bites at Sssyd with it's many mouths. Attack: 4 Damage: 21 (If this attack hits make a Strength ST)

Strength ST against Dust Devil: 17

The gibbering mouther takes 1 damage and is pushed away from Sssyd, who recieves an opportunity attack.

Recharge for blinding spittle: 6

This action resolves BEFORE Sssyd's opportunity attack. The gibbering mouther spits a blinding glob of spittle. Sssyd and Aegean, make Dexterity ST's.

The gibbering mouther has taken a total of 32 damage.

 Dex ST:  14

As the mouther is pushed, Sssyd swings his scimitar again.

Attack: 10 Damage: 6

Sssyd's scimitar bites deep into the mouther. 

Sssyd/Aegean!

(If you try to move within 10 feet you must make a DC 10 Strength check.)

Pleased with bite of his scimitar through the creature’s flesh, Sssyd swings again. 

Attack: 21 Damage: 8

(Did damage get rolled for the dust devil?)

Aegean dex save: 20

The cat runs towards the creature again. If it doesn’t get stuck (13) it gets in the creatures face again to distract it and Help the next person to roll an attack against it. 

Aegean remains back at a distance and casts Toll the Dead again (dc13 wisdom save or take 8 damage)

(so looking at the gibbering mouther, it looks like it only actually says you need the strength save when you start your turn in 10 feet, doesn’t say anything about moving there)

(First I need a WIS ST from Sssyd and Aegean.)

Wisdom ST: 9

The gibbering mouther has now taken 42 damage. 

Wis ST: 10 

Sssyd passes and proceeds to wound the monster.

(Shouldn't I be out of range of the gibbering anyway?  I'd backed up last round to be 35 feet away) Wisdom: 14 

(Yep, my bad, I missed that post. You're good. So much to keep track of!)

Top of the order with Donaar! (Wisdom ST to start the turn, Strength check if you move within 10 feet of the gibbering mouther.)

Wisdom:24 Donaar will become an axe beak and swing at the mouther.( was the dust devil going to do damage or no? Would it pick up the ground?) 11 strength

Attack: 6 Damage: 8

Edit:never mind, can’t do that. Donaar will still wild shape and move to the mouther, but will also move his dust devil up to the mouther without getting himself in range. I’m new to playing a Druid, sorry.

Merzin!

Wis: 17

Merzin will stay where he is and shoot once again.

Attack: 14 Damage: 4

Sneak attack dmg (If any enemies of the gibbering mouther are within 5ft) 7

(dice did not work when I first posted)

(I assume Donaar cast Dust Devil behind the mouther so that his allies are not affected.)

The gibbering mouther is now seriously wounded at 51 damage. It bites once again at Sssyd. Attack: 5 Damage: 17

Strength ST against Dust Devil: 11

On a failed save 4 bludgeoning damage and on a successful save half as much.