What is over here?

We then continued on past where we had fought the rock creatures. Very soon we found 3 large scaly creatures with many heads resting in a water area. They did not seem to notice us, so we took some time to try to remember if anyone knew anything about these. Rosa and Mel recognized these as Hydras. We decided to leave them sleeping, because they looked scary. Zebott decided to see if he could sneak forward to see what was around the corner, past them. He was gone for a short time, before he snuck back to the group. He told the group he had found another glassed in, seeming viewing area. He also found the bottom of the ladders that led back up to the room where we had fought the mimics. We decided to head back into the central column that led up and down to check out the door on the far side. It turned out to lead to a walkway with the clear stone walls where we could see more of the rough hewn cavern. However, Mel found a hidden door in an alcove along the way. We were surprised to find we were on the other side of the glass wall where we had fought the sonic dinosaur thing. There was no sign of the creatures we had seen watching us fight it. We did find a door with no handle, but it did have several odd looking key holes. Mel tried to pick the locks, but quickly found they were well beyond her skill. We continued searching further. Mel found another concealed door. This one led to some stairs leading down. We left them and turned to a nearby door, where we found a storage closet. Searching in here we found several minor magic items. We took some time to let Rosa identify the items before moving on. Down the stairs beyond the secret door that Mel had most recently found seemed to be a dead end. About this time, Rosa did notice some glyphs outside the room we had just found magic in. He could tell they were abjuration, but not much else. Sprite took a look & was able to tell that the glyph was activated through touch, but not exactly what it would do.
Griska slapped his hand onto the glyph and the clear walls lowered. Trial and error showed that this was a toggle for the walls. The group decided to lower the walls and see where the areas off of the dinosaur room went. We found stairs that led back up tot he teleport area that leads here and following the wide hall leading south we found it led to the far side of the arena we had passed several times. Once again, the Shanrigol Behemoth was standing quietly in the arena. This time we noticed one of the snake creatures taking notes while observing the Shanrigol Behemoth. We decided to give it a show! It was a tough fight, but we took it down. We decided to heal up and then head back to town. However, after the 1st 10 minutes we were interrupted by another group of creatures! 4 of the little razor knife guys led by one of the snake-like casters with a sword held in it's tail. We made fairly quick work of them, before making our way back to town without delay this time. Once we made it back to town, we noted we had left behind a sword and possibly other items, with the last couple of fights. We should head back there and search for items when we return!