So here is what i found out till now for the boss:
1. it spawns quite often - every 1-2 hours
2. it doesnt drop potens armor
3. it drops 2 pieces of armor each time
4. it has different spawn places in crescent - so far i know 4 of them
5. there is a daily quest with him 85 lvl - gives essence of nightmare, essence of terror x1
I think it is a good job by gravity. No potens drop, so no use for campers. It will be nicer, if the one who finds it, puts a megaphone so the people can join for the daily quest.