first failed the 3th part. I started with a lot of t3 buffs active, just to realize that the monster now deal 1-4dmg on me. Because of that i could hold aggro with my heal, and the monsters were always running to the npc's
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So i made 2 strategy adjustments.
1st I noticed that the spawn points are fixed, but the position of Roumen and Elderine is not. So i moved them, with the help of the mobs(roumen and elderine att the mobs, and the mobs att/follow me). It works as long they are attacking, because after that they mov slowly back. Now the Trick: Everytime they started talking i moved up to the camp the monster spawn soon after. And because they cant find Roumen and Elderine(who are a bit behind killing a few monster) they all attack u. Now move back and wait for the next wave, but make sure to keep aggro. (aoe attacks or in cleric case:rejuvenate)
My 2nd Trick is cleric spezifc. Because i had too much def, they did not hurt me at all. So i removed my armor. That way dmg increased nicely. Why did i do that? Because Heal/Rejuvenate aggros as much as u heal: no heal no aggro. But u only aggro monster that attack the one u are healing. So u cant take aggro from the npc's that way.
Hope that will help ya. With these Trick i finished with +0 weapon and npc unharmed.