He has transcended death in a way akin to the Hive. He has his own very small throne world that exists in the sea of screams. Although he now exists without form, he’s not dead nor is he capable of being any kind of boss.
English
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So is his body in his throne room or he is only the spark While his soul is in the in his throne world
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He’s entirely formless and moves between planes in the same way a taken does.