Gaat is a rare and potent substance harvested and procured exclusively by the Zemek. It is the primary nourishment that sustains the Illistus and fuels the cultivation of a Gem K’lyim. By Haaduic law, it is forbidden for the Haad to partake of Gaat directly — the penalty for transgression is severe, for it is believed that such consumption corrupts the balance of nefek. Rezah is unusual in that she cannot consume Gaat at all, a mystery that sets her apart even from other K’ly.