Tymm will hop into the water and secure a rope to the front of the craft so that he can pull the rest of the troupe along.  (Someone will have to direct him where to go though)

Sky will begin to paddle the makeshift, yet beautiful, craft along in the direction the eye is pointing, while keeping those in the water close by. 

While Sky paddles Eima will be on the lookout for anything coming up or swimming in the water.

Perception: 7+3 = 10

EDIT:
Second perception with Tymmy's help (in next post): 13+3 = 16

If Sky is paddling, Tymm doesn’t really need to tug the skiff, so he’s just trudging along next to the craft, also alert for potential dangers.

(Helping Eima on Perception)

As you begin trudging and floating through the dark waters, you notice just in time that the water does not seem to float and move quite as you expect, and before you can get to a narrower pass, the water churns mightily as a weird spouts from the waters!

Combat order: 

Eima

Tez

Water weird

Sky

Tymm

From where she sits on the raft, Eima is a bit startled by the sudden appearance of the water weird. "I hope those eyes aren't just for show." she says while waving a small bit of fleece. An image of thick overgrown roots appears around her on the raft behind which she attempts to get in place for an attack, her two daggers in hand.

Action: Minor Illusion
DC 13 investigation check to see it's an illusion
creating thick overgrown roots within the 5x5x5 box to take cover

Bonus Action: Cunning Action hide
stealth: 18+7 = 25

[[ Figure by the time it comes around to her next time, can hopefully get advantage for sneak attack and still have the bonus action second dagger if needs be, with allies within 5ft. ]]

[[ I really hope water weirds don't have blindsight. ]]

Tez wasn't happy at all to step into the murky waters. Not so much for whatever monster would lurk inside but simply for the feeling of murky water seeping into his boots, and his wet pants clinging to his legs. "Whoever ventures down here to gather can't be up to no good. If there was any doubt about that. Or perhaps the eye is just mistaken or malfunctioning. I can't imaging anyone going willingly this way!" He complaints continuously since they had to step into the water. 

"What in the nine hells is that?" He exclaims stopping dead in his tracks. Reflexively, being closest to what certainly doesn't look friendly, he fishes a tiny spider-like construct out of his pack, which -- on his touch -- activates a large number of little lights on its front that almost look like little eyes. It climbs up Tez's arm and comes to rest on top of his pack. "Hope." Tez announces as much as he commands and the little spider sends out a soothing wave of invigorating energy in a 10 foot radius.

Eima creates an illusion to help them hide! We'll see if the weird notices or not!

Tez puts up a protective barrier using their mechanical marvel!

The water weird sloshes out a water arm at Tez but only manages to sprinkle him a bit with dirty water! (7 to hit misses!)

Tymm is showing uncharacteristic restraint. As much as he’d love to smash this thing, he is going to keep close to his friends and wait for the creature to make the first move. 

(Holding an Attack action for when a party member takes damage from the creature)

Quote from nightbird1219 >>

Tymm is showing uncharacteristic restraint. As much as he’d love to smash this thing, he is going to keep close to his friends and wait for the creature to make the first move. 

(Holding an Attack action for when a party member takes damage from the creature)

 (Just fyi in case you didn't know: if it is a melee attack you have to already be in melee or hope the creature comes within range, you cannot move and attack as a held action together. Right now you all are not in melee with the creature, it is 10ft away)

Quote from Gnomesftw >>

Quote from nightbird1219 >>

Tymm is showing uncharacteristic restraint. As much as he’d love to smash this thing, he is going to keep close to his friends and wait for the creature to make the first move. 

(Holding an Attack action for when a party member takes damage from the creature)

 (Just fyi in case you didn't know: if it is a melee attack you have to already be in melee or hope the creature comes within range, you cannot move and attack as a held action together. Right now you all are not in melee with the creature, it is 10ft away)

 I had a feeling it would come within range at some point before my next turn, so I figured I'd wait and see what it does/what the others with better ranged attacks might do.  HULK SMASH is pretty much the only tool in my belt

Sky, realizing this creature will not let us pass without a fight, "so a fight it will get."

BA - He calls upon the Hawk spirt to aid him and his allies in battle against this water weird. 

Action - Seeing no one near the creature yet creates a tiny ice knife and throws it at the creature. (9 24 to hit due to Adv; 1 damage) and (DEX 13 Save or take 8 more damage)

Adding to Sky's mystic ice knife Eima adds her own. "Take this ye watery blighter!"

Action: attack with dagger: 
To-Hit: max(7,6) + 5 = 12
Damage: 4+3 = 7 piercing
Sneak Attack: 1+1 = 2 additional piercing //assuming it's even a hit

"Curses!" she mutters as the first dagger goes off without that much grace while adding her second dagger to the mix.

Bonus Action: attack with offhand dagger
To-Hit: 12+5 = 17
Damage: 2 piercing

[[ if possible, would like to throw through "gaps" in the roots to maintain the illusion. ]]

After throwing the daggers she draws out her crossbow, readying for her next shot.

Object Interaction: Draw crossbow

(For got to mention , everyone has advantage in attack)

Tez relieved that his contraptions seem to work fine in this environment gets sour when the weird splashes him with dirty water and complains, “This was totally uncalled for!” In vengeance he steps 5 feet forward and lifts his blue-energy-crackling staff, directs it at the creature, and tries to connect to it. The moment he touches the water, second thoughts run through his mind, 'Is that a good idea? An electric discharge in the water?''

Action: Shocking Grasp, to hit 17 (23 if advantage or disadvantage) for 1 lightning damage.

Now that battle is fully underway, Tymm simply grins.  He sprints (as fast as one can sprint in 3 ft of water) towards the creature.  He lifts Notch and brings the axe down in a powerful overhead chop, shouting with glee all the while.

Attack: 8

(womp womp)

Quote from GR_Mustang >>

(For got to mention , everyone has advantage in attack)

[[ What from? Looking at the hawk it has

Hawk: use your reaction to grant an ally advantage on attack. Advantage on Perception.

which I thought would apply to only one attack, which was used on the Ice Knife Sky cast. Did I misunderstand the ability? Or is the advantage from something I'm missing?

]]

(The advantage comes from a reaction by Sky. You only get 1 reaction per round, thus only 1 attack, while in the aura, can get advantage)

Sky ice knife's the weird creature making it bubble angrily! (Dex save: 12, takes full damage)

Unfortunately Tymm's swing goes wide in the murky tunnel!

Round 2 ready!

Quote from Gnomesftw >>

 

Round 2 ready! 

Eima and Tez already posted for round two:

Tez rolled the attack again in case you feel an attack with electricity in water or on a water-based creature has implications (be it advantage like for metal armour, or disadvantage for some reason).