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It's clear that Aranthir is acting on Ashan's orders to save the empire, but there must be some personal gain for him, just like for Markel. He also saved the empire, but he also established control over it and promoted his own cult. As for Aranthir, he should simply have a monument erected in his honor and be included in the pantheon of Ashan's saints – this behavior is somewhat uncharacteristic for a necromancer. But again, this is just my personal opinion, no offense intended.