3-1: Beneath the Streets

"Hopefully they aren't excrement insects," Adran mutters.
"Snakes and reptiles also mulch, right?" Elowin quips in response, as she turns to see why Eozindra called the warning. Elowin casts Faerie Fire on the tunnel behind Elysia, so that the effect flashes over the centipedes that are skittering toward Elysia and the creature lurking in the water. The tunnel behind the party glimmers with otherworldly moonlight, as does the second group of centipedes and the creature in the channel.Gripping his staff tightly, Morik hops past Elowin into the sludge and attacks the swarm on Ishi. The staff blurs, whooshing through the air, each swing catching an arthropod and crushing it. In this way, Morik precisely picks off 9 of the centipedes.
The remaining centipedes under and on Ishi - which we'll call "Swarm1" - crawl on and attempt to sting him with their many forcipules.
Adran follows his sister's gaze, his crossbow coming up and around to release a bolt into the water toward the submerged creature.
Shuddering with a revulsion that transforms into eye-bulging rage, Ishi yanks out his war hatchet and begins to furiously scrape the bugs off of him. Six of them fall in pieces.
The other group of centipedes - which we'll call "Swarm2" - continues its forward movement into Elysia's personal space, crawling on her and stinging her savagely, repeatedly. Swarm2 crits on Elysia.

Elysia takes 23 damage and remains - barely - standing.

Recovering from her initial shock, Eozindra sings out a malediction on their antagonists (casting Bane on Swarm1, Swarm2, and the creature).
Whipping out her rapier, Elysia leaps, stomps, slices, and stabs at the stinging arthropods in her space. Blurring with speed in her desperation, she destroys 12 of the centipedes in Swarm2.
The submerged shape of the creature emerges from the water, long, feathery tendrils groping toward Adran. The artificer tried to dodge the feelers, but they brushed against his scale mail, and the scales began to rust and crumble (Adran's Scale Mail is reduced to AC13). The creature is a Rust Monster!Now that round one's actions are resolved, what will each of you do for round two?

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22- Elowin (24/24)
16 - Morik (33/33)
16 - Swarm1 BANE
15 - Adran (26/26)
11 - Ishi (35/35) ENRAGED
10 - Swarm2 BANE, Faerie Fire
9 - Eozindra (15/15)
5 - Elysia (1/24)
5 - Creature BANE, Faerie Fire

Adran's AC drops by 1 as his Scale Mail armor begins to rust.

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Elysia is badly hurt (1 HP remaining).
There are three enemies: Swarm1, Swarm2, and a Rust Monster.
All three enemies have the effect of Bane (a penalty to attack rolls and saves) from Eozindra's concentration.
Swarm2 and the Rust Monster are on Faerie Fire from Elowin's concentration, so attacks on them have ADV.
Adran's AC has dropped 1, from 19 to 18.
That ends round one.

What do you all do for round two?

Early in round two (right after Elowin's turn), when Morik wades forward, he stumbles on something below the surface of the sludge. It's some kind of creature...or at least the remains of one. Now it's a rotted corpse that was stuck on something under the water. It is bloated with gases and bursts as it hits the surface, releasing a stinking cloud. The stench is so strong, so sudden, and so foul that every PC must roll a CON save, DC12, to avoid being Poisoned (Morik rolls with ADV, Steel Defender is immune).

I'm running out the door for a bit, but before I go, here's some quick follow-up questions:

1) @forkbeard: Ishi was already raging. Is he going into a frenzied rage this turn? I'm assuming so, since that would have given him the ADV that you rolled, but I wanted to make sure.

2) @forkbeard: Do you want me to roll the DC12 CON saving throw for Ishi? I will when I return in a few hours if you haven't.

3) @runekyndig: Do you want to roll a second attack roll (to represent the ADV from Faerie Fire) for Elowin's spiritual weapon, or shall I?

4) @MaJunior: Any commands from Adran for the Steel Defender?