2 ways for him to spawn, wait for the "defend the Warsat" event (around 20 to 30 mins apart) or hang around a little longer and you will see the message " the forces are moving against each other"
He will spawn with the Hive ship but appears to spawn in one of two modes, indestructible shield mode or killable with a little effort.
Take a couple of willing buddies to keep the adds off your back when you fight him because it can be mayhem. Hit him with arc heavy and Melee because the shield is his life. Knock down his shield and he will die like any other knight.
Good luck mate, I solo'd him with Bladedancer and Thunderlord if that helps
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I'll bring friends along for sure
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I might be crazy but i believes he's way tougher during the public event, I killed him in the "war" event that happens on skywatch, I've also seen him during the public event and I couldn't even put a scratch on him with my Thunderlord