Cheers, Chris.
Now for the rest of the story:
You guys would've escaped the goblin camp eventually. Either by regaining strength and spells, or by help of the orcs (depending on whether or not you guys would've impressed them with your Bootskull-skills).
The humanoid with wings was a Kelden (Audalis race) who lived around these mountains for all his life. He was able to tell you the entrance to Chakranna. If you guys had failed to get information from him, since so far you didn't attempt to converse with it, there would've been other ways of finding the entrance (another was of course Tann's use of ranger skills).
Once inside Chakranna, you would've found out it was infested with Goblins. The goblins were looking for something, and the name 'Avesaath' would return regularly. Depending on how you guys would've played the whole scenario, you would've found out more details about what was going on.
1 ) They are looking for an old Portal, called the Chakran Portal
2 ) The high priests were guided by a powerful demon. It was this demon's involvement that kept all the clans and even the orcs in a somewhat peaceful union.
3 ) It is not the first time this demon has led the goblins troops. The last time its reign caused the demise of the Chakrandrum, but was soon after ended because its worshippers were systematically wiped out. Now it's back and looking for the Portal once more.
4 ) The demon's name is Avesaath
5 ) Draven had a special scheme, and was also involved with Avesaath, though how exactly this was all played out depended totally on Valimar's actions.
6 ) The demon's plans were to enter Audalis through the Portal and claim the lands as a new God in the Pantheon.
7 ) The mutated animals in Sylvaria were caused by the poisoned trees (you guys knew so much already). The poison that was being used carried a small part of the essence of Avesaath.
8 ) The open Portal would also allow the goblin forces to invade Khordal (the Khordaldrum kingdom) unexpectedly. There were already some 'possessed' Khords and infiltrated Goblins in Khordal at the beginning of the adventure.
How you guys would've ended this whole scenario was not planned out. I deliberately let this open, because I believed in your capability to come up with a good plan. Also, since there were so many factors at play here, I couldn't possibly plan things ahead in detail without limiting your freedom.
In the end two things could've happened:
1) You guys stop the demon from entering the world of Audalis and therefore stop the rise of power of the orcs and goblins (of course aided by Sylvarian troops). You guys get a huge amount of XP, become heroes and even make it back to Guland Granitefingers for a Fat Check.
2) A new God enters the world, throwing everything off balance, creating chaos, in which you guys would've had to flee the mountains to join the forces of good to fight back. In this case you guys would've also go a huge amount of XP, would've also become heroes, but the campaign would've gone on for a very long time, the story changing into you guys having to help the forces of good destroy a God... wow.
Hope you guys enjoyed this little scenario.