Rik casts a spell, targetting the apes and giant ape...

Giant ape save: 14
ape 1 save: 6
ape 2 save: 17
ape 3 save: 13

Sinsil will still use Extract Name on the large ape to charm it, but after she casts color spray at 1st level on as many apes as she can without targeting the big ape or her allies.

Hit points effected by color spray 33

Sinsil's spell hits two of the apes, who are both blinded.

Zubin's arrow drives into the wounded, and blinded ape, taking it down.

The giant ape jumps down as well, and attacks Shieldbiter... With two fist attacks:
Fist one: Attack: 17 Damage: 31
Fist two: Attack: 21 Damage: 28

Larry casts his spell and a bell rings near one of the apes. It takes damage from the bell.

Back to top of order, please post your next actions.

Shieldbiter is unconscious.

(DM, were those attacks with the -d4 from bane?)

Sinsil will cast mind sliver against the giant ape. Dc 15 int save or take 7 psychic damage and subtract 2 from next save.

Good catch.  They were not.

Subtract...

First fist attack:  3

Second fist attack:  1

Guessing the first attack will miss Shieldbiter now, but not sure on the second, betting that one still hits.  Is Shieldbiter up now or still down?

First one had already missed. AC of 19.  So now the second is a tie so hit or miss? How do you call it? If it’s a hit than it is same situation.

Ties go to the roller, sorry.

Wel then he is down 

When Shieldbiter falls, Zubin starts searching for a plan. "Larry," he asks, "if you target that crumbling ceiling with that bell of yours, do you think it's loud enough to collapse some of it?"

Early post:

Opal, his shortswords still swinging, heads for the closest ape.

Shortsword attack: 15; damage: 7 piercing damage

Bonus shortsword attack: 24; damage: 4 piercing damage

Sneak attack if appropriate: 13

If he still has some movement, he then backs away 10 feet.

I need actions from everyone...  Ethan will attack the giant ape.  Striker, Ethan's Familiar, will take a healing potion from Ethan's pack and pour it down Shieldbiter's throat...  What is everyone else doing?  I have Opal's and Sinsil's actions.

Zubin takes a glance at the crumbling ceiling to find a likely spot. Then he nocks an arrow and aims for the giant ape's head. 

Attack: 18

Damage: 5+13 sneak

 He waits for the shot to connect. That ought to get its attention. "Hey!" Zubin waves and shouts at the giant ape. With exaggerated motion he moves to 60' from the monster, leading it under a weak spot in the ceiling. "Yeah, you, you lousy-looking lemur!" The taunt might not be understood, but the noise and motion will be. "Come and get me, you son of a motherless monkey!"

Larry will utter the darktongue and point the Giant Ape and the one next to it (or any two that are close together)

Chill Touch

Attack1 24 Damage: 10

Attack2 23 Damage: 9

He will then focus on the air immediately above the Giant ape, uttering more of the gutteral tongue...

Bonus Action cast Spiritual Weapon

Attack on giant ape 24 Damage: 11

Rik will swear viciously in Sylvan - everyone's too grouped up for him to shatter the apes without also harming the company. 

Dissonant Whispers at 3rd level against the giant ape -  Wis16 save (less bane) - if it fails, it takes 21 damage and has to use it's reaction to run away from me

Opal moves in on the non-blinded ape, slicing it twice and leaving it dead on the ground.

Striker initiative: 8

Ethan mentally commands Striker to take a potion of healing to Shieldbiter, pouring it down the other's throat.

he then sends his flaming sphere in to strike the giant ape...
Ape save: 22
Fire damage: 4

Moving in himself, he attacks with his long sword, casting booming blade
Attack: 16 Damage: 13

Ethan then uses misty step to move away from the giant ape, hopefully making the ape move to catch him, and get it away from Shieldbiter.

If the giant ape moves... 13 thunder damage.

Shieldbiter, make a death saving throw...

The blind ape runs around crazily, smashing into one of the walls.

Rik casts his spell...
Giant ape wis save: 12

Sinsil casts her spell...
Giant Ape int save: 15

Zubin shoots the giant ape in the head, drawing its attention.

Striker pours a healing potion into Shielbiter... Heal for 12

The giant ape moves away from Rik, (It would have done this as its reaction earlier...) and towards Zupin and Ethan, who are trying to get it away from Shieldbiter.

On its turn, it attacks Ethan...
fist 1: Attack: 19 Damage: 24
fist 2: Attack: 13 Damage: 26

Lary casts his spell on the giant ape...

Back to top of initiative... The smaller ape is no longer blinded.

Ethan goes down...

Sinsil will let out a sigh. And then cast magic Missile at 3rd level on the giant ape.

Damage: 8

She'll then move toward the brass doors.