For Yvandra:
You rush around the perimeter of the room, and shoulder open the stone door on the far side. Nothing happens in the fire room, the fire doesn't appear to move or react in any way. In regards to what you see beyond the stone doors, you find yourself in a rectangular room, where the walls, ceiling, and floor are made of smooth white marble tiles.
There is a bas-relief on the north wall of the room, which depicts lines of Elven hoplites engaged in warfare with horde of pig-faced Orc barbarians. There is a ornate marble sarcophagus in the center of the room. There is an open archway to the north, and another one to the south. From this angle, you can't see anything further.
For Skywise:
If you tried to walk across the floor while sticking to one set of sigils, you'd narrowly pass within the bounds of the large circle, closer to the column of flame. It would be possible though.
For Alvin:
You head back the way you came. The sound of falling water continues to get louder, until you eventually come to an open archway. The open archway leads into what appears to be a large open chamber, with cold water cascading from the ceiling, like an enormous indoor shower. There are iron grates in the floor near the door, where the water is draining into.
Squinting through the falling water, you can see some sort of white stone pedestal or altar, at the centre of the room. You see that there is a large rectangular glass box sitting on the pedestal. Inside the sealed glass box, there is a two-handed sword, the blade of which appears to be made of silvery-white metal. The sword otherwise appears to be unornamented, but looks like a high-quality fighting implement. There doesn't seem to be a mechanism to open the glass box, it's properly sealed shut, but the entire box can be picked up, it's not fixed to the pedestal.
Looking down, you see that there are iron drainage grates all around the perimeter of the room, but seemingly no other entrances and exits. As you turn back towards the pedestal, he suddenly catches a strong smell of ammonia in the air, and you catches a quick glimpse of a greyish, slimy-looking, roughly man-sized humanoid figure crouched down underneath the iron grates, looking up at you with inhuman yellow eyes that catch the light. Before he can react, the weird creature moves backwards, and disappears from view. It's impossible to see down into the space beneath the iron grates with your current level of light, and the water pouring down makes it even harder to make anything out, it's like staring down into your shower drain.
What do you want to do?