Panoptes was a really cool boss that had the misfortune of being in an underwhelming DLC. His design was awesome and intimidating, and the fight was very cool thematically. People often ask for "single player raids". Panoptes was a single player raid boss. Add one or two more mechanics and he'd fit in with any other raid boss.
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Just fought him a few days ago in a heroic story mission trying to get triumphs done. Nah, he's a trash boss. In a trash mission. In a trash DLC.