Agar carefully watches the mists swirl you aren't able to tell much but you know this mist is not natural though I doubt anyone is particularly surprised by this information.

Jonathan -- You look carefully for tracks of the beasts but surprisingly you don't see a single track. They just seem to disappear  about 50 feet from the giant stall wall and it's cervices. It's very peculiar. You also note that each of the breaks in the rock wall have a strange green-black goo lightly speckled on the stone.

Gunthar smiles at Calwin, "You are rather clever man Mr Calwin" he says as the white sword appears on his shield. "I rather like that look perhaps when this is over I shall use some of gold to make this mark a perment symbol of our company!" He clasps you on the back "Careful in their my friends" He says to all of you as he and his group walk slowly into the right most cavern. 

Similarly Saria nods and head into the left most tunnel. Her weapons are drawn and the white sword is proudly displayed on the front of her light armor.

Anything else before wander into the final, central tunnel?

Jonathan picks up a hand full of rocks and throws it at the black goo.

The rock sticks to the goo just briefly then slowly falls to the ground in a sticky mess. 

You take your que from the other groups and head of into the cavern. As you round a bend in the canyon, you come to a place where part of a limestone wall has sheared off. The resulting rocky scree is covered with a mat of irregular fungus, with some toadstools reaching the height of a man. The collapsed wall has not completely blocked the passage, and there is a 10-foot-wide path of relatively flat ground that the wagon could easily move through. The cavern continues forward and bends a bit out of sight. 

"I don't like this. I think this tar will coat the wagon wheels and I'm not sure of the properties of it."  he looks on the fungus and tries to remember anything he read and or encountered before. 12 Nature or 5 History.

(Seriously) 

You look carefully at the fungus but unfortunately there is nothing that you can recall regarding it's properties. You are able to determine fungus and mushrooms are not native to this area. You have never seen or read anything that looks like these fungi before.

Sallah: "Maybe one of you with a strong throwing arm can toss a good sized rock at one of those elf-high toadstools, to see if something bad happens. After that, I could use my armor to send a lightning arc, if energy has a different response than a rock..

"All of this should be done at a safe distance. And I didn't want to be impulsive and zap a toadstool if there are better suggestions."

Speaking of distance, you are about 40 feet from the fungal mat and the then mushroom thing. Not that it is important.... I promise... 

Jonathan shrugs  and in a almost humming voice he picks out one and says "You're the ugliest shroom I've ever seen" vicious mockery 

Wisdom save dc13 2 psychic damage

Cal hefts a rock before heaving it at the mushroom. 

20 (rolled STR without proficiency if it's considered improvised)

Sallah zaps a different batch of mushrooms with his armor's Lightning Launcher.
(Range of 40' is no problem.
If something insane happens after the earlier insults and rock throwing, like Tiamat emerging from the fungus, then obviously Sallah would use his Action to run instead of shooting a lightning bolt.)

• Attack: 22 Damage: 9 lightning

Johnathan whisper's reach the mushroom and watch as the fungus seems to wilt and whither just a bit. As it recovers from the insults you see it draw itself up to height and pull air into it's stalk. It then releases of the built up air in a long, loud shriek of anguish. The sound is deafening and continuous.

The hefted rock sails wide of the mushroom but you all watch as two grey-green ooze squeeze from the cracks in the walls and start heading in your direction. (Sallah, I will let you decide what you would target with the blast. Either ooze or the screaming mushroom)

Initiative!

Agar: 14

Calwin: 18

Jonathan: 16

Sallah: 22

Ooze 1: 22

Ooze 2: 14

The mushroom continues to howl and cry as the enemy approaches! Both ooze have emerged from the walls a convenient 30 feet away. (We will do this fight without a map unless it gets complicated. I am going to posting from work and it can be a bit tough for me to make maps at work.)

Sallah is up!

Initiative. Active turns in RED (dmg)

• • Sallah
  • Ooze 2
  • Agar
  • Calwin
  • Ooze 1
  • Jonathan

   

Sallah uses his earlier lightning blast on the shrieking mushroom (not yet noticing the oozes).
He moves back 10', to be 40' away from the approaching oozes.

(Ooze2 next, then Agar and Colwin.)

The mushroom explodes into a thousand tiny fungal fragments and the air goes completely, unnaturally quiet. 

The ooze rolls toward you all with a surprising speed an agility. Long pseudopods propel it forward toward Calwin as it sense the flesh on his bones. A long tentacle of slime reaches out at the gnome and flicks at his leg

Pseudopod Attack @Calwin: 13 Damage: 4 Bludgeoning

Agar and Calwin are up!

• • Sallah
  • Ooze 2
  • Agar
  • Calwin
  • Ooze 1
  • Jonathan

"HA!", Calwin exclaims as he shrugs off the blow and swings his warhammer down on his slimy opponent, spittle flying from his mouth.

Raging Reckless Warhammer Attack: 16 Damage: 9 and 6 radiant damage

((Plus another 2 bludgeoning))

(Move to the ooze other than the one Calwin is attacking and Dodge action to impose disadvantage on all attacks against him)

Agar thinks that his slashing weapon won't be much use against an ooze and instead plants himself right in front of the other one, shield in front of him and prepares to defend himself and his companions, counting on them to actually kill it.

Calwin's attacks splatter the ooze sending bits of it flying against the walls. While it's strength appears significantly impair the ooze appears ready to continue it's fight.

Sensing Agar in front of it ooze one knows no better and strikes with it's pseudopods at the well armored adventurer.

Pseudopod attack @Agar: 23 Damage: 6

Jonathan and Sallah may take their turn!

Order:

• • Sallah
  • Ooze 2 (12)
  • Agar
  • Calwin
  • Ooze 1
  • Jonathan