As you all get ready to leave, Jair does what little he can for the corpse of Karakas, and then casts his spell, determining that none of his equipment is magical--except for the vial of liquid, which gives off a faint magical aura of some sort.
Ydyr ventures out cautiously into the echoing darkness, using the lantern Lehko holds for light, as he watches Ydyr from the opening. He very quickly discovers that he has left the Citadel completely, and is exposed in the ravine itself. The floor here is made up entirely of crumbled masonry, and is extremely unstable underneath him. And in fact, Ydyr hasn't gone more than ten feet before he feels a large piece of rubble shift beneath his feet, dumping him into the darkness below! The slab slides down with him, narrowly avoiding crushing him underneath it, as he finds himself in a small debris-strewn cavity in the floor. He is unhurt, but it will take some skill--or luck--for him to climb out. And, as you all freeze in your sudden startled silence from the way Ydyr just seemed to vanish from your sight--you can hear faint, multiple squeaks floating out there in the void...
Apparently, the ravine is inhabited after all.
((Jair does not have spellcraft, so cannot id the vial's magic school. Ydyr's balance check: 1+2=3.))