Invasion Boss spawn tips?

I'm looking for one boss for my challenge, Judgement Apparatus.

I think they all spawn in normal since I killed everything but that one before getting to cruel. I'm starting to see Corrupted Zone bosses in cruel, which makes me think that it's better to keep looking in normal for Invasion bosses for the Challenge.

Am I correct in thinking this?

I'm just going in and out of Vaal Ruins hoping to get him.
I've only seen it 4-5 times, only time I can remember specifically was pre-nerf, in caverns level 1, he spawned on that very thin bridge, was impossible for me to do anything.
Last edited by aga110 on Apr 3, 2014, 7:30:29 PM
killed him on wetlands an hour ago
"Yeena thinks she knows the Spirit. That it talks to her. She talks to herself." -Greust <3

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