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Marinda was a senior priestess of the Sisters of Elune. It was she who informed Tyrande Whisperwind that she had been chosen as the new high priestess. During Tyrande's initial tenure, she was chosen to succeed Whisperwind in the event anything should befall the new high priestess. Shortly after that, an Eredar warlock killed Marinda. Maiev Shadowsong succeeded her as interim high priestess, who in turn returned the title to Tyrande.
High Priestess of Elune (interim)
Maiev Shadowsong (interim)