Angry, insane, or just plain beastial; Barak is beyond healing.
Paranoid of the future; longing for the past, Niandra needs a new master.
Real World: some Indians in the Amazon treat their eyes with a traditional potion applied with palm leaves. Brutally painful, the drug alters vision, giving the jungle's dense green walls greater texture and dimension. You could adapt this to desert or swamps, or other hard to navigate regions.