Sheya T'Lorn

Sheya T'Lorn is a rare monster that only spawns if you pass close enough to each of 6 wisps labeled "a watcher of Sheya." Once all wisps are free, they fly into the first main cave at the bottom of the cave passages (the first area where you have to break through the wall). The wisps rotate in a circle in this main area briefly before spawning a domed force field in which Sheya T'Lorn spawns (but not always).