Crimson Sands of Time

Trisk will follow Ethan and guide him like you suggested, at least as far he can (a round or two at most?) and direct his 10 silver coins to move and Dash in case we can catch up before their duration is up (6 or 7 rounds left?).

Instead of going the long way around or following the old tunnels I'm sure Ethan will just blast through the odd wall that blocks our progress. And if Ethan isn't enough to get through a wall for some reason (unlucky low damage rolls?) then everyone else can also help plough our way through. I take it we're all going after this thing?

As you snake through the twisting maze of corridors, treading waist-high water (let's say knee-high since it's not difficult terrain) you come to an arched doorway, surrounded by the crumbling remnants of the adjacent wall.  Surrounding the portal is a foul fungal growth, a dripping green mold flecked with red, a yellow-green membrane partially occluding the doorway. Impenetrable darkness extends beyond. (It's not magical darkness, there's just nothing to see but the surface of the water on the other side.)

"It looks like the foul creature went that way."

Pointing ahead toward the portal with the crumbled remnants of the wall near the portal Trisk glances left and right to see if there's any other direction it could of gone, not expecting to find any but more to confirm they are on the right trail.

Oli follows Ethan and the others to the portal. "Of course the fiend had to lead us to a foul looking doorway." he says flatly, then starts looking for any traps hidden in the mold or membrane, using a regular dagger so as to not touch the mold.

Perception in log: 16

Randy stays directly between Ethan and Trisk as he continues to clear a path. "There should be a hidden path straight ahead if I recall. You went down And..." Randy hesitantly replies whilst he reloads his ammo but keeps a reasonable distance in case a trap emerges. "I say at some point we could ambush that bozo before we get ambushed ourselves. Let's get moving. Ethan, I hope you know what you're doing!" 

In the meanwhile, just in case, his orange gauntlets Emit an orange pulse wave Just in case his brother misses out on anything whilst the group pursues the beast.

You don't see any trace of the demon.  When Oli pokes the membrane with his blade, the mound moves in response, a pseudopod peelsing away from the wall and whipping the harengon, with two others quickly following. 

Tentacles x Oli

21  for 18 poison damage

Tentacles x Oli

23  for 18 poison damage

Tentacles x Randy (if he's within 15ft)

25 for 18 poison damage

Oli, Randy, Trisk, and Ethan: make a Wis save

<post above mysteriously flagged, so I edited it. all the new rolls are lower. Use those>

Trisk's WIS save: 20 

Ethan's save: Nat 20

Oli dodges the first attack (AC 17) as he half expected something, but was surprised by the second and is slammed into the wall. "Look out, it's alive!" Oli shouts a warning to the others as he looks at his wound.

Oli's WIS save: 22

tetrevess moves to catch up with the party, again conversing via telepathic bond.  his manifest mind comes with: 

Randy WIS Save: 10

Triskellion for a moment hears a faint buzzing in his head as he nears the creature. The next attack roll, saving throw or ability check he makes is at disadvantage.

Randy, hears it too, but the sou d fomenting madness within him, leaving him in a state of confusion. 4

Randy cannot move or take actions during this turn.

Dashing to the scene, Tetrevess will need to make the DC18 Wis save at the start of their next turn unless otherwise noted due to changing conditions.

Oli 28 ▶️

Sam 23 ▶️

Monster 19 ⏸️

Tetrevess 17 ▶️

Randy 9 ▶️

Trisk 6 ▶️

Ethan 3 ▶️

tetrevess just makes it with an 18 wis save

Oli steps forward and swings at the monster in front of him with the dagger already in his hand, not yet noticing the effect it has on Randy and Trisk. Only after his attack does he realize he is not using his psychic blades. He then stores his normal dagger so he can attack twice next round with his psychic blades.

Attack with normal dagger: 22
Damage: 7 piercing

I assume Randy is w/in attack range so, Sneak Attack damage: +18 piercing (25 total). If not, ignore Sneak Attack damage.

<nobody but Oli within 5ft.  The tentacles (as the books calls them, I say pseudopod because it's a slime) have 15ft reach the other effect is farther and takes neither any action nor concentration, in case anyone wondered>

Oli's dagger finds its mark, but the slime doesn't seem to notice

(its resistant, so 3 damage - just to be clear)

"Randy?! RANDY WHAT HAPPENED?! SNAP OUT OF IT! ARE YOU OK?!" Ethan yells as he suddenly notices his brother half dazed despite his efforts to shake him back to reality. "Damn it... whatever that spell was must have gotten to him..." He decides to attack whatever just hindered his brother from a distance. "Bunny boy! Duck!"

BA: The slime is Hexed (without spell slot if hasn't been an hour; Since the previous monster that suffered under his hex died) 

Strike 1: 14 to hit, 7 Force 

Strike 2: 13 to hit, 14 Force 

Strike 3: 14 to hit, 13 Force 

All of them deal an extra 3 Necrotic from Hex

Ethan finds it hard to hit the narrow band of slime surrounding the arched doorway in the narrow flooded tunnels from behind Oli, Randy, and Trisk. All three shots miss the creature.

From beyond the archway, something splashes in the darkness. A column of murky foul water blasts at Oli as the demon who grabbed Trisk makes his presence known once again, the grasping Spout under its control reaching hungrily for the harengon, attempting to pull him through annular region of the slimy membrane'occluded archway.

Oli: DC17 Str save or take 22 acid damage and be pulled 60ft through the slime archway.