Osha is the twin sister to Merla. Though barely a few days old, the two are given the task of incorporating humans into their plans to win back the Elements. But their visions have been split. While Merla focuses on giving gifts to a human alchemist so that he may be the One as she believes he is, Osha sees deeper into the future what her sister lacks and realizes that more must be involved to complete their task.
“Grant me this one favor…” is the last request Merla hears before she’s transformed into the infamous Dark Horn that opens the series. It is also the last line of book four No’va.