Crimson Sands of Time

Randy feels it first as he strides through the muck.

Trisk makes it a few more steps, dashing across the sticky floor before it happens to him, too.

Beneath the thick ooze, there are at least two holes in the solid floor, concealed by the opaque slime.

These open sinkholes are 5 feet across and 10 feet deep, and they are filled with slime.  A creature that falls into a sinkhole is restrained in the narrow bottom and submerged in slime, unable to breathe. It takes a successful DC 15 Strength check or Dexterity check to work free, and a Small creature has advantage on this check. It then takes a successful DC 10 Strength check to climb out of the sinkhole.

 Any creature that starts its turn prone in or submerged in the slime takes 4 poison damage

The little girl seems to fade, then disappear entirely.

Trisk's DEX check: 20 

Trisk's STR check: 14 

Triak remains stuck in a pit, foe now, feeling the acidic slime burning his skin as he struggles to free himself.

At this rate, it will take Picollo 5 rounds (30 seconds) to reach Trisk. However, as she watches the slime, she observes something.

Picollo notices the unusual flow of slime in and around a particular spot.  Thus, she surmizes, might be another sink hole. (I literally don't know if she can warn the others in her dispersed form, though.) If she's right, it means she could, in theory see other sinkholes as well, by looking closely for this same pattern. Of course, she was only able to see this one when she was nearly on top of it: the movement is quite subtle.

Does Ethan keep going when he sees Randy fall in the hole, or does he stop there?

If he lets him, Ethan will pull his brother out of the hole (Strength: 17)

DEX if needed to help pull him out: 13

Tetrevess looks back at the situation with the brothers in shock, and says “Let me know if you need help.. might have something I can do, if needed.  What happened to the little one?”

Quote from PyromaniIsDeadThankGod >>

If he lets him, Ethan will pull his brother out of the hole (Strength: 17)

DEX if needed to help pull him out: 13

 They're 10ft deep. How do you pull him out?

Sam won’t go into the slime but ask “is the other side got a black gate or is it an opening” 

Since he and Randy are invisible, Ethan extends his massive grappling appendages to hoist him out whilst he maintains his own balance. Judging by the ripples, his waist or arms should be close by. "Hold on tight! I'll get you out of there!" He whispers without letting anyone know.

Trisk may be trapped in the bottom of a slime hole but due to his Periapt of Proof against Poison which reads as follows:

This delicate silver chain has a brilliant-cut black gem pendant. While you wear it, poisons have no effect on you. You are immune to the poisoned condition and have immunity to poison damage.

(ooc: please let me know when it's next round so I can try to get out again, lol, ... I've been slimed!)

General time info, specifically in reply to @Brian_Avery

 If you've played baldurs gate 3, this is a lot like a poison gas trap room. The environment gets a turn each round, but the party can act as they please. If one chooses not to, they can just end turn. It's pretty soft at the moment, since you're all invisible and the environmental effects require sight.

Tetrevess has to make saves each round, though, so he might change his mind about hanging out while the others cross the pit, or not.

The boheloderspawn are lighting up the room as their eye rays blast the solid illusion of Sam.

(I've decided that a real illusion is an object, and thus would auto fail a Wisdom save. Grey area since they don't target  objects, raw, but they have no way ro distinguish.) 

 7, 6, 3

(LOL. Results)

The real 'illusory' Sam falls asleep, slumping into the slime with a splash. Eye rays continue to bombard him as he wakes up and starts to get to his feet, knocking his legs from under him and sending him 5 ft back and down again into the slime. As he stands again, more rays push down again 5 ft the other way.

< @Brian_Avery, if you want to roll the saves 5x and out automatically on the first to succeed, that's how long it takes Picollo to get there.>

As Ethan's oceanic appendages extricate Randy feom the slime pit, the sticky ooze drips from his body.  Slime now covers Randy as well as Ethan's arms.  The eyes have spotted the brothers.A burst of narrow lights showers the pair from all about the room

Ethan and Randy, make a Wis save.

Ethan's WIS: 12

Randy's WIS: 14 (If this fails he'll use his last flash of genius to try and rectify that)

The weak eye rays cause strange visions to flash for a moment through the minds of both brothers, but they are gone just as quickly. What could these stray thoughts mean? Each, for an instant sees his brother attacking their allies. But nothing actually happens. Does it?

(No, it doesn’t)

Rolling checks for Trisk, per PM 

1 16 1

2 11 17

3 20 7

4 8 10

5 19 8