It is indeed based on the map of the Tyr region. The valley south of the Pallas Valley is the one at the same level as the village of Walis. I juste detailed a bit more the area and the different factions.
Tareks could indeed be one of the factions of the valley. But at the same time I was wondering which factions could be active in the valley to the south, so why not the tareks ?
The real active “factions” are the herders, the giths, the halflings (with a renegade group causing trouble with the other halflings clans based in the village of Wayra, and impeding commerce), the belgois (a small clan of 10), the elves and the slave-tribe.
Herders and elves will be neutral, commercing with the trading post but trying to cheat.
Giths will be the “immediate” threat.
Slave-tribe will be agressive, but with careful approach and negotiation could be turned into ally.
The ones operating the copper mine will be trading more and more with the village of Khira instead of the trading post of Pallas, with opportunities to change that.
And the other monsters will be threats during the exploration of the valley.
It is based on a french campaign named “l’héritier” : http://jdr.ariistef.over-blog.com/article-28085440.html