Leshi

The Leshi are the one kindred of the Met Sakinsa that can live without magic. In Footwizard Bomoadua explains the distinction to the expedition:

The Leshi are so sensitive to the world that they have managed to survive here without it, when most Met Sakinsa require it, in one form or another. They were planted here for that purpose, despite the lack of magic.Bomoadua, Footwizard

Their purpose is specific. The Leshi were deliberately settled in Anghysbel to ward the Kurja — a vassal-race of the Formless imprisoned in the caverns beneath the valley. When the Kurja emerge, the Leshi and their servants keep them from leaving, and the jevolar itself keeps their sorcery suppressed. It is a cage the Met Sakinsa help maintain, and the Leshi alone could bear the posting because they alone among their species do not need the Magosphere to live.

In Preceptor, when a thermoplastic eruption forces an evacuation of Anghysbel, more than three hundred Leshi come through the portal to Vanador — tall strong-limbed males, shorter bushier females, and platforms heaped with saplings of the various subspecies they cultivate. Their first encounter with the magical Magosphere after centuries in the jevolar is profound: the response is communal and physical, a shaking that passes through the older Leshi before the saplings. Prince Maralathus's memories are Minalan's chief guide to Met Sakinsa culture, but he knew only the magical ones; the Leshi are a different experience altogether — and, as Minalan warns an unwary noble:

The males regularly fight with monsters five times their size, in Anghysbel. The Leshi are not to be trifled with.Minalan, Preceptor