I’ve only heard two things about him. (Nezerac’s sin, Nezerac’s whisper). What is his sin? What was is his whisper? Is he alive? Where is he? [spoiler]licks finger [/spoiler]
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Likely a former/current disciple of the witness that once commanded the lunar pyramid. Pretty much everything else is speculation based on the two lore tabs. I’d suggest you read them if you’re curious. I’d expect him to maybe show up more going down the line and a possible appearance in the story right before/after Lightfall.