Seeing the rest of his group quickly annihilated by the powerful adventurers, the Time Collector quickly readies himself to flee. Sure he was aging more quickly than he'd like, and he obviously wasn't getting any younger (especially since these adventurer's weren't paying their toll!), but he'd rather keep aging for a while and find new victims, then toy with these people any longer. They were likely to kill him!
"It seems that my window of opportunity has closed. Good luck finding your way back home in the dark! Oh, and I'd run now if I were you...I just marked this place as a beacon for all Unseelie within a two mile radius. Ta ta for now!"
And with that, the gnome-like figure disappeared from view, leaving the glen very quiet. At least, that is, until you started hearing a low rumble and buzzing sound coming from the distant south and east. It was slowly getting louder. Evidently the gnome wasn't lying about the beacon!
[sblock=perception DC 20]
What you're hearing sounds an awful lot like the earth rumbling of the dwarves and the buzzing wings of the sprites you just fought...but to hear them from such a great distance so loudly... there must be thousands of them coming! [/sblock]