Tempe 13 Initiative 

Goblin Squad One Initiative: 7

Prone roll: 43

Initiative Round 1

Pepin
Goblin Squad One
Petcan
Zenodor
Randall
Tempe

Those who started and want to continue opening one of the pipes can do so, it will cost your action.

You can also stop to deal with the goblin squad.

Or some can deal with the goblins while others try to open the pipes.

(Simply post what actions (open pipes/attack goblins) you want your character doing on turn one... plus whatever else... bonus action, movement etc.)

The goblins have fallen prone upon entering the pumping station and the area that is being affected by the Control Water spell is considered difficult terrain.

(How spread out is the Goblin Squad? For AoE attacks/spells)

Pepin stops opening the pipes or a moment as he takes his all-purpose tool from which suddenly a tiny cannon emerges that lands on Randall's shoulder. After which he uses one hand for a short moment to make some intricate movements on his armor.

"I call upon you, Valkur, to protect my friend Randall from those goblins and give me the strength to quickly open the pipes."

as he casts shield of faith to give Randall a bonus to his AC of 2.

((so action: create eldritch cannon Flamethrower on Randall's shoulder. BA shield of faith.))

The goblins spend half their movement regaining their feet and move 5 feet closer towards each of you.

Groups of 3 goblins each move toward Pepin, Petcan, Zenodor, and Randall.

(Petcan is up. Zenodor is next.)

I think Petcan will keep opening the pipe

Z will cast Synaptic Static, trying to cover as many of the Goblins within its 20ft radius sphere as possible.

Damage 32 Psychic, or half with a DC16 INT test.

After a failed save, a target has muddled thoughts for 1 minute. During that time, it rolls a d6 and subtracts the number rolled from all its attack rolls and ability checks, as well as its Constitution saving throws to maintain concentration. The target can make an Intelligence saving throw at the end of each of its turns, ending the effect on itself on a success.

Randall:

Randall keeps guiding the increasing flow of water down the tunnel at the goblins and away from his friends.  As an afterthought, he conjures a glowing mace and sends it at a goblin headed his way.

Spiritual Weapon:  Attack: 30 Damage: 17

Pepin creates a tiny cannon mounted on Randall's shoulder and wards him with magic.

The goblins struggle to regain their footing in the flow of water and make any headway toward the party members.

Petcan opens the pipe he is working on and more water cascades into the room.

Zenodor uses magic to make a psychic explosion that kills 11 goblins.

Randall continues to guide the flow of water and summons a spectral mace that nearly takes a goblin's head off.

(Tempe is up.)

(How many Goblins are there in total? Was it 12 originally, with 9 dead - so 3 remaining?)

Tempe though sure his spell wont work once the goblins have to swim cast spike growth to give his friends a break in defending. He points to a point "Don't pass that point" he says as he casts the spell.

(Yes 9 dead and 3 remaining from squad one. 1 of the 3 remaining is barely alive.)

After Tempe places his spike growth spell a 2nd goblin squad enters the pumping station.

68

Initiative for squad two: 15

The 2nd goblin squad does not fall prone but still has to deal with moving through the water flow (difficult terrain).

Initiative for Round 2:

Pepin
Goblin Squad One
Petcan
Zenodor
Randall
Tempe
Goblin Squad Two

Oh yeah... Mignon does not fight but at the end of round 1 he decides to start climbing up the access shaft.

"I'll check and make sure we can get out this way!"

So Pepin is up?

Pepin uses his action to open the pipe again. While his bonus action is used to activate his cannon.

Targetting a 15ft cone from Randall (he has 15ft movement to move around on his shoulders so should be able to target any direction) with as many goblins as possible. DC17 dex save for 10 fire damage.