3-2 The Forgotten Abbey

Round Two
(for the start of this combat, please read the round one post. It is continued with round three)

Just as Morik had done before him, Ishi bursts free of the entangling folds of the transparent creature. Ishi is no longer Grappled or Restrained.
In the absence of communication from Adran as to how long it will take them to appear, Elowin strings her bow and nocks an arrow, ready to perforate the first target to appear in the archway exit from the library.
Like the barbarian, the bear is 20' down in the murky water. Morik bites into the creature and rakes it with his claws (both attacks hit [!], but now Morik is certain that it is immune to piercing damage). The invisible-while-in-water creature takes 11 slashing damage. Morik remains 20' underwater.
Elysia whips out her sword, dives headfirst into the pool, swims down, quickly orients herself on the large shaggy form of her companion, and attacks the creature with her rapier. She, too, realizes that she has hit the creature but that it is unaffected by what would have been 12 points of piercing damage. Elysia is also 20' underwater.Like his sister, Adran waits for someone to appear, whereupon he will loose his weapon as well.
Faithfully waiting by the artificer's side, Mara waits for a command.

The transparent liquid creature, either confident in its invisibility while in water or too stupid to do anything but attack when creatures remain in its lair, attacks Morik again. Morik is struck for 15 damage and is Grappled and Restrained again.

With the ease of long practice, Eozindra hauled back the arms of the crossbow and locked them into place, slotted a bolt into the channel, and loosed the bolt with a KA-CHUNK into the depths of the pool. Looking around for anything else that might be of help, she notices something about the shelves...

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20 - Ishi (24/35) Underwater
15 - Elowin (17/24)
10 - Morik (Bear 10/34 Dwarf 33/33) Underwater, Grappled, Restrained
8 - Elysia (24/24) Underwater
7 - Adran (26/26)
7 - Mara (20/20)
7 - Thing (invisible while underwater)
1 - Eozindra (15/15)

End of round one

Eozindra rushes past the pool, discharging her crossbow into the water, and then takes cover behind a bookshelf, content to wait with Adran for the two rounds it will take for the speakers to arrive. The bard's crossbow bolt whizzes past Morik's fuzzy ear and passes through the creature harmlessly. If it hit the creature (it did, but he's not sure, because the creature is invisible while it is in the water), Morik observes, it did not slow down at all.ROUND TWO
With a wild thrashing of his muscular body, Ishi breaks free of the grapple. Ishi remains 20' underwater, but is not Grappled or Restrained.
Elowin calls upon Lunea in song, casting Faerie Fire on the pool. The creature, Ishi, Morik, and Elysia must all roll DEX saving throws, DC13 (note that Morik has DISADV on DEX saves from being Restrained). The invisible-while-in-water monster fails its save and is outlined in Lunea's glow, as does Morik. Ishi and Elysia avoid Lunea's limning. Attacks on the creature have ADV, which cancels out the DISADV from invisibility, so they are straight rolls now. Attacks on Morik continue to have ADV (from being Restrained AND from Faerie Fire), so no change there.
Morik bites into the creature and rakes it with his claws (both attacks hit [!], but now Morik is certain that it is immune to piercing damage). The invisible-while-in-water creature takes 11 slashing damage. Morik remains 20' underwater.
Elysia whips out her sword, dives headfirst into the pool, swims down, and attacks the creature with her rapier. She, too, realizes that she has hit the creature but that it is unaffected by what would have been 12 points of piercing damage. Elysia is also 20' underwater.
Like his sister, Adran waits for someone to appear, whereupon he will loose his weapon as well. Realizing that they won't arrive for several more seconds, Adran pulls the trigger intending to hit the transparent monster. The crossbow bolt disappears into the pool with a splash.
Faithfully sitting by the artificer's side, Mara waits for a command.The transparent liquid creature, either confident in its invisibility while in water or too stupid to do anything but attack when creatures remain in its lair, attacks Morik again. Morik is struck for 15 damage and is Grappled and Restrained again.

Edit: It is Eozindra's turn, and...
With the ease of long practice, Eozindra hauled back the arms of the crossbow and locked them into place, slotted a bolt into the channel, and loosed the bolt with a KA-CHUNK into the depths of the pool. Looking around for anything else that might be of help, she notices something about the shelves...

Elowin and/or Adran can amend their turns in case they misunderstood that the speaking residents will not come into view this round.

In addition, everyone except Eozindra can declare their round three turns, too..

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20 - Ishi (24/35) Underwater
15 - Elowin (17/24)
10 - Morik (Bear 10/34 Dwarf 33/33) Underwater, Grappled, Restrained
8 - Elysia (24/24) Underwater
7 - Adran (26/26)
7 - Mara (20/20)
7 - Thing (invisible while underwater)
1 - Eozindra (15/15)

END OF ROUND TWO
With the ease of long practice, Eozindra hauled back the arms of the crossbow and locked them into place, slotted a bolt into the channel, and loosed the bolt with a KA-CHUNK into the depths of the pool. Looking around for anything else that might be of help, she notices something about the shelves...

Elowin calls upon Lunea in song, casting Faerie Fire on the pool. The creature, Ishi, Morik, and Elysia must all roll DEX saving throws, DC13 (note that Morik has DISADV on DEX saves from being Restrained). The invisible-while-in-water monster fails its save and is outlined in Lunea's glow, as does Morik. Ishi and Elysia avoid Lunea's limning. Attacks on the creature have ADV, which cancels out the DISADV from invisibility, so they are straight rolls now. Attacks on Morik continue to have ADV (from being Restrained AND from Faerie Fire), so no change there.
Too focused on the disappearance of his comrades to notice anything odd about the objects in the room, Adran looses a bolt into the deep.
Mara waits.

ROUND THREE
Meanwhile, deep underwater, Ishi attacks the unseen creature, cleaving the water in his fury. The creature takes 13 slashing damage.
Rolling over and over, thrashing in the monster's grip, Morik tries and fails to break the grapple.
Adran prepares to shoot the first person to appear in the archway to the south.
Mara awaits orders.