There is nothing to be seen or heard of Hreishar, so Tathlyn also moves closer to the cave in, after a closer inspection of the skeletons. He confirms Sheiriya's observation about the crossbow bolts. Certainly of drow making, if a bit odd in style. Taking one to mull on where he's seen somesuch before, he closes in on the hole in the floor.
Sheiriya can easily glide to the bottom, noticing some magical indications about the creation of this shaft. The floor of the cavern below is wet an moss-covered, this place looks pretty natural and "untamed". The drow apparently entered through a smallish crack in the wall. Near the bottom of the shaft, Sheiriya spots the bones of some happless wilderness creatures, who dropped down and died here ages ago. Nothing can be heard.