Jelly #4 will attack Rush.

Attack: 23  Damage: 6 bludgeoning damage, 5 acid damage

The jelly creature lashes out with the very same whip-like appendage at Rush and makes contact. With a squelch of liquid against Rush's face, this whip-like pseudopod hits and does 6 bludgeoning damage and 2  acid damage, thanks to Rush's natural resistance to acid.

((I already applied the damage to your character sheet.))

Kwisatz is up!

Here is where everyone is physically located at the top of combat round 2. (Jelly #4 is colored red to indicate that it's dead.)

Kwisatz will again find a piece of rubble to catapult at Jelly 1 - Dex, DC 13, or 16

Jelly #1's Dex saving roll: 0

Jelly #1 gets his by the full force of Kwisatz's catapult and is splat all over the altar that is now jellystained as well as bloodstained. Jelly #1 is dead.

Rush is next!

Rush will swing the spiritual trident at the next jelly 

Attack: 13 Damage: 10

and follow it up with another toll the dead dc 13 wis save or 6 Necrotic damage

In an arc of light,  the spectral trident swoops through the air at Jelly #4. The connecting hit squelches and then clangs as the trident cuts through the jelly and hits the ground. The jelly doesn't reform. Seeing that jelly die, Rush directs his necrotic bell to toll for the final Jelly.

Jelly #2 WIS save: 4

The bell rings and the jelly reverberates with necrotic sound energy. it takes 6 damage.

Sael is next!

Sael reaches for her boomerang, and whips it at the jelly.

Attack: 7 Damage: 5

The boomerang leaves Sael's hand and easily hits the jelly square. The boomerang then sinks into the jelly. It can be seen similarly to fruit inside of a Jell-O mold. It does 5 damage. 

Next up is Oban.

Oban will, again, use his action to strike with one shortsword and then use his bonus action to strike with his other shortsword. 

Attack 1: 20 Damage: 11

Attack: 15 Damage: 8

And, once again, Oban swings furiously at this jelly and paints the southern stone wall, as well as the southeast pillar with jelly spread.

 With the death of Jelly #2, combat is over. There is an almost deafening silence after the lightning fast attack. After a few seconds, the party hears the sound of cautious footsteps. Norbus and Dazlyn make their way back into view at the entrance of the temple, both looking around cautiously. 

"Well, we told you we wouldn't fight," Norbus says in almost unintelligible grunts that might have a hint of guilt attached to it. 

"Are they gone?"  Dazlyn asks. "And," speaking to Kwisatz, he says, "did you say that you found another secret door?"

Sael inspects her boomerang to see if it's safe to pick up.  She doesn't bother with the slime.  Nothing to keep.

Investigation: 22

She is able to pick up her boomerang.

"Ah... Those were fascinating creatures." Kwisatz says. "Somewhere between a liquid and a solid. Considering they attacked together, maybe they even have a social structure. We should be on watch as there may be more."

Then turning to the dwarves says "and yes! It was just as you said. A small button in the wall. Just over this way!“ as he leads the group towards the opening he had just discovered.

Looking through the doorway, Kwiz and whoever else is following can see into a hallway that is only about 10' long before ending in a 3-way intersection. You can see some rubble poking around the left corner and no rubble to the right.

Sael steps up and peeks inside the hallway.  She scans the walls and asks "Shall we carry on?"

"Please, lead the way. I have a feeling there is more to find in these ruins." Kwisatz says, and continues investigating the walls for arcana, writing, or secret rooms. 18 ((womp womp))

With that, Sael steps in front and leads the way down the hallway. (I'm assuming that's what you meant by "carry on"?)

At the 3-way intersection, Sael looks to her left and sees that what used to be a hallway that direction has been completely blocked by a cave-in. There is nothing but huge boulders and rubble. To the right, the hallway extends another 20' and ends at a doorway.

Andrømeda, no longer enraged, though disappointed at the rapid conclusion to the fight, shakes her head a bit. "Holt a moment, Am'm thinkin our alv friend may net to heal." She gestures towards Oban. "He vas hit hart when those.." she then gestured towards the viscous slop that was left splattered about the area behind her, "squishies, først attackt."

Sael look back at Oban.  "Do you need assistance?"

Looking pretty beat up and limping slightly, Oban says with a wince, "Well, I've definitely seen better days."