So, at the end of the last game the party had fought off a griffin, then gotten distracted by one character's obsession with freeing the Gnome Saboteur and claiming him as a pet.
OOC, I had offered this player the chance to drop his character Kaz, a human monk who was raised by wolves, and create an entirely new one. In character, Kaz would have gone running off into the woods and become a gnome collector, and probably would have resurfaced eventually as the sort of threat that the party had to defeat. As it is, the gnome himself - who was using the name Jou - has vanished into the woods and will probably show up in future games, still working for House Bri'yann.
But Kaz's player had a change of heart during the week, and decided that he'd keep Kaz and make up with the rest of the party, which he pretty much did. So Kaz managed to master this strange madness, made his apologies, and stayed to help the group deal with the griffon issue.
So, the first thing they did was start moving the horses into the dining tent at night. This may not seem like the most sanitary idea ever devised (and it did cause some logistical issues) but it also kept the remaining two horses from being eaten. Meanwhile, the party kept watch outside at night, and once they thought they saw a griffin up in the sky, but nothing approached the camp.
So, after two days, they hiked to the nearby cliffs and went looking for the griffon's nest.
Climbing up was done in stages -- the cliff was not sheer, but it was reasonably steep -- with the Monk and the Halfling Rogue going first and then lowering a rope to help the others climb up behind them. Everybody made it to the top with no issues (three Athletics checks for everybody, with somewhat more difficulty for the monk and rogue).
The top of the cliff turned out to be a narrow but reasonably-flat but narrow ridge, extending the along one side of the valley. Since they do not see any griffons, they start walking along the top of the ridge.
About noon, the monk spots a ledge a little further down the cliff, on the side facing the camp. A moment later a griffin comes flying off the ledge, and everybody sees that. The group opens strong, with a series of missile attacks damaging the already-damaged griffon. Then a second griffon joins the fray, and there's a brief moment of freaking out. The group does finally rally and manages to take the second griffon down as well.
Investigating the nest, they discover a pair of griffon eggs and promptly claim them, with an eye towards eventually raising the griffons and using them as mounts.
The adventure is complete; everybody levels up.