It has been noted that this is a potential TPK if players just saunter in thinking they are D&D heroes.
This encounter did provide my campaign's first PC death, though admitedly the player did something that had the other players all saying "you do what?"
They tried to use tactics, misdirection etc.
From my summary:
When shall we five meet again, in thunder, lightning or in rain (first PC death).
The heroes passed safely through the Oberslecht (acing the progress tracker and keeping the element of surprise - metagame this was easier for because they're 5 PC's to try things rather than the 3 the designers assumed as PC number, I could have adjusted for that but decided not to, they really needed surprise to have a shot at things). The party decided to forgo the cart as being too much trouble perhaps in the terrain.
Coming up on slumbering, restless beastmen including Izka the group split with Findulas and Anselm to draw foe with missile fire, and then Krieger, Matthias and Guy to get in after the stone. The Beastmen were suprised but after initial surprise scented the waiting trio and the scenario played out with two gangs of hornless beastmen being drawn after the two and more weight of the Beastmen falling on the trio - including Izka.
The beastmen had to add a challenge die to their initiative reflecting surprise and all acted after PC's, PC attacks before the beastmen acted gained a fortune die each.
I extrapolated the "3 player" written version and made it Izka, two Gors and 3 gangs of 5 ungor henchmen types, Izka at stone, the others all medium to long range from it - scattered about clearing.
Findulas and Anselm dispose of the two gangs with little risk to themselves though this kept them from aiding their comrades. I rule that with missile weapons, taking down multiple foes with one shot means striking off that many arrows or whatever.
Matthias was badly wounded (even after using a healing draught), with he and Krieger suffering additional critical wounds. The three decided to fall back and the beastmen were lead a chase around to the waiting two (a roll is made to see how well they manage this, they do it well, even recovering some fatigue). Then Krieger's immobilizing shot slowed down Izka and another beastman (during this there was a Rally Step).
Matthias bravely engaged the beastmen, even though comrades called upon him to stay back so they could strike with ranged weapons alone longer, but was felled by their savage blows - dying under the beastman's savage strikes. Izka has suffered half a dozen wounds and a minor critical wound making him less agile at this point.
The four remaining comrades faced Izka, a wounded wargor and an unwounded wargor. Izka's fearsomeness (Fear 2 test) was resisted and the fight carried on. Guy suffered two criticals, Guy and Anselm both suffered many wounds (Guy being 1 wound from falling), but eventually the foes were defeated and Izka slain. Accounts differ, perhaps Findulas' arrows struck again and again piercing makeshift beastman armour, until the beastman was ready to topple and perhaps the elf's arrows but annoyed the mighty creature until Senor Bitey lept forward and fastened onto the beastman's throat, tearing back and forth as the creature dropped to its knees and then toppled.
I forgot the Fear test when Izka first emerged but recalled it, it actually worked out well narratively having it come out when he dropped a PC.
The group got the "lighting stone" from atop the herdstone - though lightning struck as they did so leaving Anselm Thunderstruck for rest of act. Their escape from the Oberslecht, carrying it and Matthias' body, was carried out well and before its inhabitants were able to marshal against them, Krieger's strength bearing the stone and his Athletics making good time, Findulas' Observation avoiding threats.
I added being Thunderstruck for the lightning hit to give it more oomph since it happened after combat.