Day 1

You successfully recall following rule from rulebook :)

Let me assume that now as you remember that you try to taste the colored potions you found in the two chests, they are all potions of resistance:

Anguis, Bellow: you suddenly feel wind and hear sound that you would expect a large flying creature to make. The dust all around you flies and no hear Phoenix: saying something in language you don't understand and you hear Elrond answering in the same language.
Phoenix suddenly tor to you and say : Do not follow us and please welcome the human who will be helping you out while we are on our duty to my patron and he runs away into the cave before you could even understand what happened.
A human comes out of the cave and you see wind blowing his dressing. You could swear you saw some aura around him for a moment, but after a moment everything is still - no more wind and no more sound of wings swinging. Just everything around you is hard to see through due to dust in the air (it will go down in few minutes if you let).

As Anguis activate his divine sense he sense the invisible Solar (https://www.dndbeyond.com/monsters/solar) who is currently in the cave and hear in her mind (telepathically)
In a moment you don't feel his presence any more.
And you all feel light wind, Anguis could guess that Solar is flying away silently

Lucas are able to understand relation between texts in other pages with the pictures. You can't read it nevertheless. However you see and some texts related to statues (see marked orange) relate to writings that seems like spell scripts rather than written text. You conclude that statues posses some magical powers. Though you can't believe that these would be spells hurting anyone - monks have been navigating through this place on regular basis, doing their routine ceremonies.

OK, let me remind the previous party found chests on the altar. There are two statues, but they stay away from them (not closer than 15 feet).
There are stairs between the two statues (they take you 10 feet down).
If you really want to approach statue, then choose which one - the one to the North or to the South?


By the way - it should be obvious that your choices are now either to go check if there are more chests on the other altar, go to the Northern doors or give up and go back to the settlement cave to south you came through). The two rooms west from you have been investigated already.