At lvl 51 I camped and killed this guy solo and it only took around half my mana. Well I turned in the crown and got the spirit of flame pop, well the walkthrough that I read says the NPC doesn't help well not true I got ksed by and NPC. So now at 54 with 26+ hours of camping him just this lvl im hoping he will pop soon so I can do the epic thing, since i got Gimblox to spawn in 4 hours. One important thing that ya guys might like to hear is the ph for Bergurgle is the middle goblin, but if it is strictly a melee (war) type gob then he has no chance of popping. His ph is a clerical gob that casts wrath trust me you will know once you engage em. Just had to let you guys know about my findings.
Just camped him for a little over 10 hours straight. While the PH is the middle goblin (right in front of Deep) he does not necessarily have to be a cleric prior to spawning the Lord. I fought two warrior placeholders and then the Lord popped. <shrug> So you have the same chance of him popping whether it's a cleric or warrior PH beforehand.
To avoid the KSing by Natasha Whitewater, is to get the damaged crown before you camp Bergurgle. Bergurgle's crown in only needed to get Natasha to spawn. So kill Shmedrik Lavawalker first, triggering the spirit of flame. Kill spirit of flame. Loot the damage crown, along with other stuff from both Shmedrick and the spirit. Then camp Bergurgle. Get his crown to spawn Natasha, and if she KSes the spirit of flame, so what!!! You have the damaged crown already. Give it to her to get Shell 1. If your able to loot the fire spirt after getting the shell, then bonus. You could loot it again or let a fellow cleric get the damage crown.
Wildar Bolderbash 49th level cleric Antonius Bayle