Colonists are rushed to meet up from the most southern colony to the most northern colony and claim it. Then the builders gifted from Qarir are to build a palisade around the entire claimed land. (Encirclement around the entire colonial area.)
Bloodsworn forces establish colonies near the lake, and countles hidden outposts. Unlike Qarir, they provide useful materials to the African states, in exchange for their loyalty, such as iron weapons, tools, greek fire, and other such things.
The Bloodsworn merchants are befuddled by why the Himalayan are doing this, and simply continue to trade with the natives. The first Bloodsworn colony, built near the lake, is named Nova Kamen. And by seeing the power of Greek fire, the natives will want it. They'll do most anything for this powerful weapon, I believe, and if we offer to make it and more for them, we can make them dependent on us for military power.