R1T9: Lilim moves forward and says, "I'll get her out of her comfort zone. If she and her lizards persist there, we are better at handling sleet storm I think."

Lilim casts her spells, and the entire southern chamber, and most of the middle chamber, is covered in a storm of driving sleet storm that obscures sight (blocking even darkvision). "Sorshen's" anguished yell can be heard from deep within.
Spoiler: ALCON
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Everything south of that dotted blue line is affected by sleet storm (see hyperlink for details).

R1T8: With a big giant thing in the mix, Rezah knows his job as a healer will be important this battle. He casts sanctuary on himself and moves forward.

R1T7-5: It is unknown what is happening within the sleet storm, and you no longer know the position of the enemy.

End Round One, Begin Round 2 ...

R2T22: Fallon casts another spell on herself and zooms forward.

R2T20: Erima, you know the spell sleet storm, including that if you go inside it you will be unable to see anything. It is useful in herding enemies towards you, though, with the possible humiliation that some fall in the attempt. What do you do?

Sinxia, you've been delaying this entire time. What do you do?
Spoiler: Battle Map (you technically see nothing south of the blue dotted line)
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The Scribe on deck, Teofilo in the hole ...