Talon would go wide-eyed as the door opens and the new room is revealed. "Arondarumalin Killiantherdus" Talon would repeat in the voice of Noche as he one again casts light on his crossbow and steps into the room.
Hoyle notices that in the room just before them and under the murky water are tiles with runes and what looks like pressure plates.
Probably a trap but you can see no holes in the walls or things on the ceiling that might work for the trap. Magical maybe but your knowledge is not good enough for that.
Noche grins and says, "Big priest of metallic Dragons. Silver man they called him a long time ago. Part of our legends. He opposes Tiamat when he can." he spits the name as if his mouth got a sour taste just saying it. "He died a long time ago but left messages and artifacts to counter the evil of Tiamat and her cults."
Talon would let out a small squawk as he was prevented from entering the room. As the runes are pointed out, the kenku would take few steps backwards. Talon would then try to cast light on one of the submerged runes on the ground and look to the others.